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【简答题】
质量为 m 的物体放在匀速转动的水平转台上,它与转轴的距离为 r ,如图 a 所示。设物体与转台表面的摩擦因数为 f ,求当物体不致因转台旋转而,水平台的 最大转速。
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【单选题】设硅稳压管 DZ1 和 DZ2 的稳定电压分别为 5V 和 8V ,正向压降均为 0.7V ,可求出图中电路的输出电压 Vo 为()。
A.
4.3
B.
8
C.
5
D.
0.7
【单选题】设硅稳压管 DZ1 和 DZ2 的稳定电压分别为 5V 和 8V ,正向压降均为 0.7V ,可求出图中电路的输出电压 Vo 为()。
A.
4.3
B.
8
C.
5
D.
0.7
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【简答题】设硅稳压管DZ1和DZ2的稳定电压分别为5 V和8 V，正向压降均为0．7 V，求图3．4．5中各电路的输出电压Vo。
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