发布时间:2025-01-20 17:09:08
没有螺纹的螺柱叫光杆。光杆排线器就可以按照光杆旋转,按照螺旋运动轨迹来回平移运动,但是杆本身是没有螺纹的。
我想知道冲9v蓄电池用多大的电压是12v的还是9v对电压有没有要求
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