graduating valve spring的意思|示意
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递开阀簧
graduating valve spring的网络常见释义
节制阀弹簧 ... 滑阀slide valve 节制阀graduating valve 节制阀弹簧graduating valve spring ...
递开阀簧 ... graduating valve lever 递开阀杆 graduating valve spring 递开阀簧 greaseless valve 无脂弥缝阀 ...