... Main Rotor Head Set 强化型的主旋翼头组 main control head 井口总闸门 main valve head cap screw 主阀盖有头螺钉 ...
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well head control block valve
... mast head span block 上千斤滑车 well head control block valve 井口总闸门 duck bill head of block 滑车的鸭嘴形头 ...
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