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【单选题】
月球对物体的吸引力约为地球的1/6,一个人在地球上能举起200kg的物体,那么到月球上他能举起物体的质量为( )A.
．200kg
B.
1200kg
C.
200/6kg
D.
无法计算
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【单选题】Text IV The Harry Potter books rapidly became one of the most in-demand book series among young readers and have earned large sums of money. Movies based on the books won several Oscar nominations ...
A.
All of the above.
B.
They sell well.
C.
Readers are eager to know what happens in the next book.
D.
They have won awards.
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【简答题】已 知 电 路 中 某 元 件 上 电 压 u 和 i 分 别 为 u = -100sin314 t V,i =10 cos314 t A。问元 件 的 复 阻 抗( )Ω。
【简答题】已知 u =100 sin (314 t -60°)V , i =5 sin (314 t +20°)A ,则 u 和 i 的有效值分别是 、 , u 对 i 的相位差是 。
【单选题】已 知 电 路 中 某 元 件 上 电 压 u 和 i 分 别 为 u = -100sin314 t V,i =10 cos314 t A。问 元 件 的 性 质
A.
电感性
B.
电容性
C.
电阻性
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