You’d better __ electricity; it would be

要使磁场中的线圈不停的旋转，则必须通过（）向线圈提供电流.

A.变压器

B.整流器

C.电流换向器

D.继电器

改错题

1.Although we are not in the same school,but we are still good friends.

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2.I would be such tired that I would want to go back home.

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3.He is so young to go to school.

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4.He got up too late that he missed the school bus this morning.

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5.Tom was ill so that he didn't go to school

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领导团队注重的“三力”有（）

A.凝聚力

B.执行力

C.领导力

D.创造力

语句“int(*ptr)();”的含义是______是指向函数的指针，该函数返回一个血型数据。

属于浮子式流量计测量部分的是（）。

A、钟机

B、记录笔

C、浮子、锥管

D、绳帽