美國(guó)PARKER比例閥優(yōu)惠美國(guó)PARKER比例閥*，也就是說，美國(guó)派克伺服閥的主閥是靠前置級(jí)閥的輸出壓力來 控制的，而前置級(jí)閥的壓力則來自于伺服閥的入口p，假如p口的壓力不足，派克前置級(jí)閥就 不能輸出足夠的壓力來推動(dòng)主閥芯動(dòng)作。而我們知道，當(dāng)負(fù)載為零的時(shí)候，如果四通滑閥*打開，p口壓力=t口壓力+閥口壓力損失 （忽略油路上的其它壓力損失），如果閥口壓力損失很小，t口壓力又為零，那么p口的壓力 就不足以供給前置級(jí)閥來推動(dòng)主閥芯，整個(gè)伺服閥就失效了。所以派克伺服閥的閥口做得偏 小，即使在閥口全開的情況下，也要有一定的壓力損失，來維持前置級(jí)閥的正常工作。美國(guó)PARKER比例閥優(yōu)惠美國(guó)PARKER比較閥*，一般說來，好像伺服系統(tǒng)都是閉環(huán)控制，比例多用于開環(huán)控制 ；其次比例閥類型要多，有比例壓力、流量控制閥等，控制比伺服要靈活一些。從他們內(nèi)部 結(jié)構(gòu)看，伺服閥多是零遮蓋，比例閥則有一定的死區(qū)，控制精度要低，響應(yīng)要慢。但從發(fā)展 趨勢(shì)看，特別在比例方向流量控制閥和伺服閥方面，兩者性能差別逐漸在縮小，另外比例閥 的成本比伺服閥要低許多，抗污染能力也強(qiáng)！美國(guó)PARKER比例閥優(yōu)惠派克比例閥、派克伺服閥D41FTE01FC4NF08 D41FHA31C2NB00 D41FWE01FC2NLW8 D41VW02C4NJP7 D31FHE02C4NB00 D41VW15C5NGW D41FHA31C1NB00 D41VW1C2NUW89 D41FWE02FC2NLW0 D41VW26H2NJP D41VW1C4NYP7 D41VW4C1NUW D41VW20H4NJP D41VW9E2NGW D41VW1C4NYW D41VW3P4NJPD41FHA31F2NB08 D31FTE01CC1NF08 D41FHE02C4NB00 D41FHE52C4VB00 D41FTE01FC4NG00 D41FHA31C4VB00 D41FWE02FC4NLW0 D41VW06C1NJP789 D31FHE52A1NB00 D41VW16C1NTP770 D41FHA61B4NB00 D41VW1C2NYP70 D41VW01E4NJP7 D41VW2C1NJP729 D41VW1C5NJW88 D41VW4C1NYC D41VW21C2NJP D41VW9E5NJP D41VW1C4VJP D41VW4C1NAP70D41FHA31F4NB00 D31FTE01CC4NF08 D41FHE02C4VB00 D41FHE52E2NB00 D41FTE01FC5NF00 D41FHA32F4NB00 D31FHE01C4NE00 D41VW10C5NJP D31FSE01B2NLW0 D41VW16C1NYP D41FHB31E1NB00 D41VW1C2NYP770 D41VW11C4NJW7 D41VW2C5NTP70 D41VW1E2NGW11 D41VW4C2NJC5 D41VW21C4NYP770 D41VW9E5VJW D41VW1C5NTW89 D41VW4C1NJP60D41FHA32C1NB00 D31FWB31CC4NLW0 D41FHE02E1NB00 D41FHE52E4NB00 D41FTE02FC1NG00 D41FHB31F1NB00 D31FSE01B4NXW0 D41VW11C1NGW D31FSE02B4NLW0 D41VW16C1NYP770 D41FHB32C2NB00 D41VW1C2VTP770 D41VW11C4VJDLJ57 D41VW2C5NTW D41VW1K2NJP D41VW4C2NTW70 D41VW22C3NJP D41VW9K3NYW D41VW1C5NYP70 D41VW4C2NGWD41FHA32C2NB00 D31FWE04CC4NLW0 D41FHE02F1NB00 D41FHE52E5NB00 D41FTE02FC1VF00 D41FHB31F4NB00 D31FTB32CC1NF00 D41VW11C1NJP D31FTB31CC4NF00 D41VW1C1NGW D41FHB61B2NE00 D41VW1C4NAP70 D41VW12C2NGW260 D41VW2C5VTP70 D41VW1K2NUW D41VW4C2VJWW D41VW2C6NTP70 D81FSE01E4NLW0 D41VW1E4NTP70 D41VW4C4NJP780D41FHA32F2NB00 D41FHB31F1VB00 D41FHE02F2NB00 D41FHE52F2NB00 D41FTE02FC2NF00 D41FHB31F4VB00 D31FTB32CC4NF00 D41VW11C1NJP2 D31FTE01CC1NF00 D41VW1C1NJP2 D41FHB61C1NB00 D41VW1C4NGW D41VW16C4NJW D41VW2C6NJW D41VW1K4NJP66 D41VW4C3NGW D41VW30H5NJW D81FSE02E4NXW0 D41VW1F1NJP210 D41VA4C1VD41FHB31C1NB00 D41FHB34F2NB00 D41FHE02F4NB00 D41FHE52F2VB00 D41FTE02FC4NG00 D41FHB32F4NE08 D31FTE02CC1NF00 D41VW11C1NJW789 D31FTE01CC1NG00 D41VW1C1NJP8 D41FHB61C2NE00 D41VW1C4NJP D41VW1C2NUW D41VW2E5NGW D41VW20B1NJP89 D41VW4C4NJPW D41VW34C4NJP D81VW01C4NYCF45 D41VW1K1NTP70 D41VW12C2NJPD41FHB31C2NB00 D41FHB61B1NB00 D41FHE52B1NE00 D41FHE52F5NB00 D31FHE01C4NB08 D41FHB61F2NB00 D41FHA61F1NE00 D41VW11C1NTP770 D31FTE02CC4NF00 D41VW1C1NJW D41FHB61C4NB00 D41VW1C4NJW260 D41VW1C4NYC7 D41VW2K6NYP70 D41VW20B2NJP89 D41VW4C4NJW D41VW34C4NTW D81VW11C1NJP D41VW1K2NJW66 D41VW15C1NJPD41FHB31E1NE00 D41FHB61B4NB00 D41FHE52B1VE00 D41FHE52F5VB00 D31FHE01C5NB00 D41FHB61F4VB00 D41FHB31F2NB08 D41VW11C1NYCF7 D31FWE01CC5NLW0 D41VW1C1NJW27 D41FHE01B1NB00 D41VW1C4NJW66 D41VW1C5NJP11 D41VW2P2NYP D41VW20B4NDP11 D41VW4C4NJW88 D41VW3C2NYP D81VW11C1NYP89 D41VW20B1NJP2 D41VW1C1NJP78D41FHB31E2NB08 D41FHB61B4VB00 D41FHE52B4NB00 D41FSA31C4NXW0 D31FHE02A4NE00 D41FHE01C4NB00 D41FHE01E4NB00 D41VW11C1NYP70 D31FWE02CC5NLW0 D41VW1C1NJW89 D41FHE01B1NE00 D41VW1C4NJW88 D41VW1C5NYW D41VW30B2NYP70 D41VW20B5VJW D41VW4C4NJW89 D41VW3C4NYP770 D41FWB32FC4NLW0 D41VW20B2NJWT D41VW1C2NTP70D41FHB31F4NE00 D41FHB61E2NB00 D41FHE52B4VB00 D41FSA32C2NXW0 D31FHE02C2NB00 D41FHE01F1NE00 D41FHE01F1NB08 D41VW11C1NYP770 D41FHA32C2NE00 D41VW1C1NKP D41FHE01B2NB00 D41VW1C4NTP770 D41VW1F4NJW D41VW30B6NJP D41VW20H1NYP70 D41VW4C4NJWW D41VW42C1NYC560 D41VW02C4NTP D41VW20B4NJP7 D41VW1C4NJP89D41FHB32B1NB00 D41FHB61F1NB00 D41FHE52C1NB00 D41FSB31C2NXW8 D31FHE52A1NE00 D41FHE01F2NE28 D41FHE01F1VB00 D41VW11C2NJDJ5 D41FHA61F1VB00 D41VW1C1NTP770 D41FHE01F5NB08 D41VW1C4NTPW D41VW1K4NJP D41VW30H2NTP D41VW20H4VJW60 D41VW4C4NKP D41VW43B2NJWT80 D41VW11C4NJP7 D41VW20B4X767 D41VW1C4NUW66D41FHB32B1NE00 D41FHB61F2VB00 D31FHE01C1NB00 D41FSB31C4NXW0 D31FHE52A2NB00 D41FHE02C1NB00 D41FHE52F4NB00 D41VW11C2NTP70 D41FHA61F4VB00 D41VW1C1NTP8970 D41FHE52B2NB00 D41VW1C4NTW D41VW1P2NJW20 D41VW30H2VJP D41VW22C4NJPW D41VW4C4NTW27 D41VW4C1NJW27 D41VW11C4NJW789 D41VW20B5NJW9 D41VW1C5NGWD41FHB32F1NB00 D41FHB61F4NB00 D31FHE52A5NB00 D41FSB32C4NXW0 D31FHE52A4NB00 D41FHE52B1NB00 D41FSE01C2NLW0 D41VW11C2NUW D41FHB31F2NE00 D41VW1C1NUW D41FHE52C2NE00 D41VW1C4NYPW7 D41VW20B1NTP770 D41VW35C1VJP D41VW2C6NTW D41FWA32FC1NLW0 D41VW4C2NJP D41VW11C4NYP70 D41VW20B5NYP70 D41VW1E1NTP70D41FHB32F2NB00 D41FHE01C4NE00 D31FTA31CC4NF00 D41FSE01C1NXW8 D31FHE52A4NE00 D41FHE52B1VB00 D41FSE01C2NXW0 D41VW11C4NJP89 D41FHB32E1NB00 D41VW1C1NYC560 D41FTB31FC1NG00 D41VW1C4NYW27 D41VW20B1NYC89 D41VW3C1NJP D41VW2E3NJP D41FWE02FC2NXW0 D41VW4C4NTP89 D41VW11C4NYP770 D41VW20B6VJW D41VW1E4NYP70D41FHB32F4NB00 D41FHE01C4VB00 D31FWA31CC4NLW0 D41FSE01C4NLW0 D31FHE52C4NB00 D41FHE52C1NE00 D41FSE02C1VXW0 D41VW11C4NJW D41FHB61C5NB00 D41VW1C1NYC70 D41FTE01FC4VF00 D41VW1C5NTP70 D41VW20B2NJP D41VW3C1NTP D41VW2E3NJW D41VW15C5NJW D41VW4C4NYW789 D41VW12C2NJP27 D41VW20D4NJDJ5 D41VW1F4NJPD31DW2F2NJP D41FHE01E1NB00 D31FWE03CC4NXW0 D41FSE02C1NLW0 D31FSB89B4NXW0 D41FSA31C1NLW0 D41FTB31FC2NF08 D41VW11C4NJW6089 D41FHE52E4NE00 D41VW1C1NYW70 D41FTE02FC4NF00 D41VW1C6NJW D41VW20B2NTP70 D41FTB32FC2NF00 D41VW2K3NJP D41VW1C1NTW D41VW4C5NTW D41VW15C2NJP88 D41VW20D4NJPX872 D41VW1K2NYPD31DW30H5NJW D41FHE01E1NE00 D41FHA61F1NB00 D41FSE02C4NXW0 D31FSE01B1NXW0 D41FSE01C5NXW0 D41FTB31FC5NF00 D41VW11C4NYW D41FHE52F2NE00 D41VW1C1VYW D41FWB32FC5NLW0 D41VW1E1NYP770 D41VW20B2VYW D41FTB32FC5NF00 D41VW30B2NYW7 D41VW1C2NTP770 D41VW4C6NYP70 D41VW15C5NJW88 D41VW20D4NJW7 D41VW1K5NGWD31DW4C1NJW D41FHE01E2NB00 D41FHB31C1VB00 D41FSE02C4VXW0 D31FSE01B4NLW0 D41FSE02C1NXW0 D41FTE01FC2NF00 D41VW14C2NJP D41FHE52F4VB00 D41VW1C2NDP D41FWE01FC4NXW0 D41VW1E2NJP D41VW20B4NJDLJ5 D41FWB31FC2NLW0 D41VW35C1NYC5 D41VW1C4NJPW D41VW4K4NJW D41VW1C1NJP D41VW20D4NUW55 D41VW1M1NYP70D31DW4C4NAP D41FHE01E4VB00 D41FHB31E4NB00 D41FTB31FC1NF00 D31FSE01B5NXW0 D41FSE02C2NXW0 D41FWB32FC2NXW0 D41VW14C2NKP D41FTB32FC1VF00 D41VW1C2NGW D41VW11C1NTP70 D41VW20B1NJP D41VW20B4NJP89 D41FWE01FC4NLW0 D41VW3C2NJC5 D41VW1C4NJW89 D41VW4P1NTW70 D41VW1C1NJW7 D41VW20H1NJP D41VW1P1NTW70D31DW4C5NJP D41FHE01E5NB08 D41FHB31F1NE00 D41FTB31FC2NF00 D31FSE02B1NXW0 D41FSE04C4NXW0 D41FWE02FC1NLW0 D41VW14C2NYP70 D41FTE04FC4NF08 D41VW1C2NJP D41VW15C2NJP D41FHB61F2NE00 D41VW20B6NJP D41FWE02FC1VLW0 D41VW3C2NTP D41VW1C5NTW D41VW58C4NJP788 D41VW1C1NYW770 D41VW20H2NJW D41VW20B2VJW20D31DW9C5NYP D41FHE01F1NB00 D41FHB31F2NB00 D41FTB31FC4NF00 D31FSE81B4NXW0 D41FTB32FC4VF00 D41FWE02FC5NLW0 D41VW15C2NJW D41FWA32FC4NLW0 D41VW1C2NJP55 D41VW1C1NTP70 D41FHB61F5NB00 D41VW20D1NTPW D41VA2C1N D41VW3C4NJW D41VW1E4NJW D41VW5C4NJP7 D41VW1C2NJP789 D41VW21C4NJP D41VW20B4VYPD31FHA60C5NB00 D41FHE01F2NB00 D41FHB61E5NB00 D41FTB31FC4NG00 D31FTA32CC4NG00 D41FTE02FC1NF00 D41VA1C4N D41VW15C4NJPC999908 D41VW11C1NJP7 D41VW1C2NJP88 D41VW1C1NYP770 D41FHE01C1NE00 D41VW20D4NJW D41VW11C2NYW70 D41VW3F1NJP210 D41VW20B2NJW D41VW6C5NTP D41VW1C2NJW88 D41VW2C2NAW D41VW20B5NJWT11D31FHA61C1NB00 D41FHE01F2NE00 D41FHE01C1NB00 D41FTB31FC5NG00 D31FTB32CC1NG00 D41FTE02FC2NG00 D41VA1C4N89 D41VW15C4NJW D41VW11C1NYC45 D41VW1C2NJP89 D41VW1C1NYW27 D41FHE01C5NB00 D41VW20D4NYP770 D41VW14C6NKP D41VW42C4NJP89 D41VW20B2NTW70 D41VW9C1NAPX729 D41VW1C2NYP60 D41VW2C2NYP70 D41VW20D1NGW255D31FHA61C4NB00 D41FHE01F4NB00 D41FHE01C2NB00 D41FTB32FC1NF00 D31FTE01CC2NF00 D41FTE02FC4VF00 D41VW00H4NJW89X810 D41VW15C4NYP70 D41VW11C1NYW D31FTE01CC2NF08 D41VW1C1X767 D41FHE02F1NE00 D41VW20D4NYW27 D41VW1C1NJP89 D41VW43B2NJP80 D41VW20B2NUW7 D41VW9C1NJW2X729 D41VW1C3NYP8970 D41VW30B2NTP70 D41VW20D1NJP D41VW20D1NTP D41VW7C2NYP70 D41VW22C2NJWT88 D81FHE52E2NB00 D41VW4C1NYP70 D41VW1C4NJP80 D41VW21C1NYP70 D41VW1P2VJP20 D41VW54C1NJP60 D41VW20B2NYP770 D41VW35C1NGW D41VW20H2NYP70 D41VW9E6NTP D41VW2F6NYW70 D81VW1C4NYW70 D81FSE01E2NLW0 D89V2C1NX729 D81VW1C4NJP89 D81VW4C4NYCF5 D81VW2C5NYPD41VW20D4NJP D41VW9C2NJW88 D41VW26B2NJW D81FHE52H4NB00 D41VW4C2NTP70 D41VW1C4NJP88 D41VW21C2NTW D41VW20B1NJP9 D41VW54C1VJP60 D41VW20B4NGW D41VW3C2NTW D41VW20H5NJP D41VW9K3NJP D41VW30B2NYW70 D81VW1C4NYW89 D81VW1C1NJW27 D89V2C3N89X712 D81VW1C4NTP70 D81VW4C4X767 D81VW2E5NYPD41VW20H1NJP980 D41VW9C2NYP70 D41VW26H1NJP D81FSA32E4NXP0 D41VW4C3NYC4770 D41VW1C4NJW60 D41VW26B5NJW D41VW20B2NYP70 D41VW54C4NTP70 D41VW20B4NJEE D41VW3C2NYW D41VW21C4NJW D81VW12C2NJP7 D41VW35C4NJW D81VW1C6NJP89 D81VW1C1NYP789 D89V2K6N70 D81VW1C5NJW88 D81VW4C6NYP70 D81VW4C1NTP70D41VW20H4NJW7 D41VW9C2NYW70 D41VW2C3NTP70 D41VW1C4NGW27 D41VW4C4NDP D41VW1C4NTP70 D41VW2C2NJP7 D41VW20B2VJP D41VW59C2NUW D41VW20B4NJP D41VW3C4NTP70 D41VW26B1NJP D81VW15C2NJW D41VW3C2NTW7 D81VW20B1NUW D81VW1C4X767 D89V4C1N70 D81VW1C5NJW89 D81VW4E1NJP D81VW4C1NYP70D41VW21C1NYP770 D41VW9C3NJP7 D41VW30B5NJP D41VW1C4VJPT D41VW4C4NJW7 D41VW1C4NYCH D41VW2C2NTP7 D41VW20B3NYP70 D41VW5C2NUW D41VW20B4NJW8 D41VW3C4VJW D41VW2C1NJPX729 D81VW15C4NTP60 D41VW42C4NGW D81VW20D1NJW D81VW21C1NJW D89V4C2N70X712 D81VW1C5NTW D81VW4E4NJW D81VW4C2NTW70D41VW21C4NAP770 D41VW9C5NAP70 D41VW30B5NYP70 D41VW1C6NTP D41VW4C4NYP27 D41VW1C4NYEU D41VW2C2NYPT D41VW20B4NJW7 D41VW6E1NJW2789 D41VW20B4NNEE D41VW3E4NUW D41VW2C3NJP D81VW1C1NJP89 D41VW4C1NJP27 D81VW20H1NJP60 D81VW2C2NTP70 D89V4C5N70X712 D81VW1E1NTP D81VW4K1VJW D81VW4C4NJW78D41VW21C4NTW7 D41VW9C5NK868 D41VW3C1NTW D41VW1E1NJP D41VW4E4X767 D41VW1C4VYP7 D41VW2C3NAP D41VW20D2NGW755 D41VW6E1NTW770 D41VW20B5NJW D41VW42C4NYP70 D41VW2C6NJP D81VW1C1VYP70 D41VW4C1NTP D81VW20H1NTP D81VW2C3NJP D89V9C2N60 D81VW1F4NYW27 D81VW59C1NJP D81VW4C4NKPD41VW26B4NTP D41VW1C1NAP70 D41VW4C1NJWL D41VW1F1NYP70 D41VW4K1NJP D41VW1E1NYP70 D41VW2C3VYP70 D41VW20D4NTP D41VW6F2NYP D41VW20D1NJW7 D41VW43B5NJW80 D41VW2C6NYP70 D81VW1C2NJW11 D41VW4C460X767 D81VW20H1NTP7 D81VW2C5NTP D91FHB31F2NB00 D81VW20B1X767 D41VW4C4NYC56 D81VW4C4NTCHD41VW2C3NYP70 D41VW1C2NJWW D41VW4C1NKP D41VW20B2NJW7 D41VW4P2NJW20 D41VW1E2NJW80 D41VW2C5NJP D41VW20D5NGW55 D41VW7C2NUW D41VW20D4NYP70 D41VW43H2NJW66 D41VW30B5VUW80 D81VW1C2NUW D41VW4C4NYP770 D81VW20H2NTP770 D81VW34C1NJP7 D91FHE01F4NB00 D81VW20B2NJW D41VW4C5NTP70 D81VW5C5NJP9D41VW2C5NTP770 D41VW1C4NJP55 D41VW4C1NYP789 D41VW20B3NTP D41VW6E1NJW D41VW1E2NYW D41VW2C5NJW D41VW20D6NTP D41VW7C3NJP D41VW20H1NTP70 D41VW4C1NJP D41VW30H2NYP D81VW1C4NJW2 D41VW4C4VTC D81VW21C4NJP D81VW3C1VYP D91FHE01H2NB00 D81VW20B2NUW D41VW54C1NJP D81VW9C1NYPX729D41VW2K6NJP D41VW1C4NJP7 D41VW4C4NGW27 D41VW20B3NYP770 D41VW7C2NJW66 D41VW1E4NYP870 D41VW2C6NKP D41VW21C1NJP D41VW9C2NUW D41VW21C1NTP70 D41VW4C1NJP7 D41VW3P2VJW20 D81VW1C5NYP D41VW4E1NJW D81VW21C5NJW D81VW4C4NGW D41VW4C4NJW2 D81VW20B4NGW D41VW54C4NJW7 D81VW9C2NJP80D41VW30B2NJP D41VW1C4NKP D41VW4C4NTC D41VW20B4NYEU D41VW7C2NTP70 D41VW1F4NTW D41VW2E6NKP D41VW26B2NJEE2 D41VW9C5NJP7 D41VW21C4NAP D41VW4C1NYP27 D41VW43B2NYP D81VW1E1NJW9 D41VW4K2NJW D81VW2C2NJW D81VW4C4NGW7 D41VW4C4NJW27 D81VW20B4NJDJ5 D41VW5C2NTP2070 D81VW9C2NTP70D41VW30B3NTP70 D41VW1C5NYC D41VW4C4NYP70 D41VW20B4NYP7 D41VW7C5NJP2 D41VW1K1NJP D41VW30B5NJW D41VW2C5NJW755 D41VW9C6NJW D41VW21C4NJW7 D41VW4C1VJP D41VW4C1NTP770 D81VW1K2NUW66 D41VW4K4NJPW D81VW2C2NYP70 D81VW4C4NYP70 D41VW4C4NTC770 D81VW20D4NTP D41VW9C1NJPX729 D81VW9C2NTWD41VW34C4NJ5426 D41VW1E4NJP D41VW54C2NDP D41VW20D2NYP D41VW9C6NJP D41VW1K4NJW D41VW30D6NAP70 D41VW2E6NYP70 D81FH-D91FH#C D41VW21C4NTP D41VW4C2NJP7 D41VW4C1NYW70 D81VW1K5NYP6070 D41VW7C1NJ729 D41VW42P1NTP70 D81VW4K4NTP D41VW4P2VJW D81VW20D4NYC57 D81FSE02E2NXW8 D81VW9C5NJP8D41VW3C4NJP89 D41VW1K1VYP70 D41VW61C4NTP770 D41VW20D5NYW D41VW9C6NJP89 D41VW20B1NJP80 D41VW30H2NUW D41VW30B5NJW11 D81FHA31H1NB00 D41VW21P1NAP D41VW4C2NJW D41VW4C2NAP D81VW20B1NJP D41VW7C1NYPX729 D41VW4C1NJP80 D81VW59C4NJP D41VW66C5NJW D81VW21C1NJW88 D81VW11C1NJW D81VW9C6NJWD41VW42C4NJP D41VW20B1NJP78 D41VW6C1NYP70 D41VW20H4NTW770 D41VW9E1NJPX729 D41VW20B1NYP770 D41VW30H5NJP D41VW30D2NYP70 D81FSA82E1NXW0 D41VW22C4NJP D41VW4C2NKP D41VW4C4NJW260 D81VW20B1NTP70 D41VW9C2NYW78 D41VW4C1NJW7 D81VW5E6NJP D41VW6C2NJP260 D81VW21C1NJW89 D81VW11C1VYP D81VW9C6VJPD41VW4C1NJW D41VW20B1NKW D41VW6C2NJW755 D41VW22C4NJW7 D81FH-D91FH D41VW20B1VJW D41VW34C4NJW D41VW43B2NJPT80 D81VW01C4NJW D41VW23B2NJW D41VW4C2NUW，美國(guó)PARKER比例閥優(yōu)惠
如需采購(gòu)，歡迎各位新老客戶咨詢我司
中級(jí)會(huì)員
第16年
會(huì)員_a.png)