题目内容

Average students who work hard usually do better than clever students who are _________.

A. steady
B. tedious
C. idle
D. keen

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变压器储油拒的作用是保证油箱内总是充满(),并减少油面与空气的接触面

A. 水
B. 油
C. 空气

Application papers may be sent ________ e-mail.

A. in
B. via
C. on
D. for

Having no money but ________ to know, Joe simply said he would go without dinner.

A. not to want anyone
B. not wanting anyone
C. wanted no one
D. to want no one

在忽略变压器内部损耗的情况下,变压器的一、二次电流之比与()之比成反比

A. 一、二次侧感应电动势瞬时值:
B. 一、二次侧感应电动势最大值
C. 一、二次侧电压瞬时值
D. 一、二次绕组匝数

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