... 混凝土模板 concrete form 棘齿条 ratchet bar 扩散焰 diffusion flame ...
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A ratchet wheel with a handle is sheathed on the core bar, and a screw can be easily screwed down or unscrewed by both hands.
在芯杆上套上一个带有扳把的棘轮，双手并用，就可以较轻松地拧紧或卸下螺丝。
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