题目内容

恒压源和恒流源实际上都是不存在的。

A. 对
B. 错

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____office is much smaller than ____.

A. Ours ; yours
B. Our ; yours
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

Who teaches ___ French?

A. we
B. our
C. us
D. ours

Look at____.

A. her
B. she
C. hers
D. i

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