推荐资源 球阀DN50 0 0 AS-Schneider截止阀和排气歧管2阀PN420 0 1 针阀 0 2 截止阀 NPS 1'' NPT Maxon 100 S MA11AA11-DD13B0 0 0 闸阀 - 闸阀 - PN 16_1Inch 0 0