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如果蓝色齿轮按逆时针方向转动，那么齿轮两 …
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当把手按照如图所示的方向转动时，4个砝码 …
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如图所示，当工程师转动把手时，两点中哪一 …
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仔细观察一下这幅图，如果手柄按图纸所示方 …
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在这个杠杆和滚轴系统中，黑色的点代表的是 …
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