5801| 22
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如何讓齒輪轉(zhuǎn)動(dòng)來控制電路的開與關(guān) |
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點(diǎn)評(píng)
就是叫速度開關(guān)吧,,有個(gè)界限可能是可調(diào)的,在界限上下是兩個(gè)狀態(tài),。
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