题目内容

电压源自身的电流是确定的，而它两端的电压是任意的。

A. 对
B. 错

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电流源的电压由它本身确定，而流过的电流是任意的。

A. 对
B. 错

恒压源和恒流源实际上都是不存在的。

A. 对
B. 错

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A. Ours ; yours
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C. Theirs ; our
D. yours; ours

A friend of came to see yesterday.

A. his ; his
B. he ; him
C. his ; him
D. him; his