I _____ a primary school student two yea_爱下问搜题

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问题选择题

I _____ a primary school student two years ago.

A. was
B. am
C. be
D. were

答案

答案：A

单项选择题

1分子葡萄糖酵解时净生成几个ATP

A．1个

B．2个

C．3个

D．4个

多项选择题

通过改变（）可使电路发生谐振。

A.改变电源电压

B.改变结构

C.改变电源频率

D.改变阻值

E.改变电路中L、C的参数