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蝴蝶阀 húdiéfá
hydroel.st. butterfly valve
tech. choke valve
water.res. disk valve; disk arm valve
蝴蝶阀蝶阀 húdiéfá
hydroel.st. butterfly valve
蝴蝶阀: 9 phrases in 3 subjects
Electric machinery1
Hydroelectric power stations6
Technology2