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為什么要一邊是左旋螺紋、一邊是右旋螺紋,僅僅是裝配習(xí)慣上考慮嗎? |
點(diǎn)評
小學(xué)單杠兩邊的固定鋼索,中間就是這個機(jī)構(gòu);老電線桿的斜拉索,也有這樣調(diào)節(jié)
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點(diǎn)評
同意
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