题目内容

Did you predict that many students ______ up for the dance competition?

A. would sign
B. signed
C. have signed
D. had signed

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By the time you arrive this evening, I ____ for two hours.

A. will study
B. will have been studied
C. had studied
D. will have been studying

请问二极管最典型的特性是什么？

A. 光生伏特效应
B. 单向导电性
C. 双向导电性
D. 折射效应

直流电动机分为哪两种类型电动机？

A. 永磁式
B. 电磁式
C. 永动式
D. 异步式

光伏组件，按照材料进行划分，可以分为哪三种类型？

A. 晶硅组件
B. 薄膜组件
C. 聚光组件
D. 钢化玻璃组件