题目内容

______yesterday, we had no idea where the child was.

A. making use of
B. account for
C. in contact with
D. up to

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The ticket for this play is so high that the audience __mainly rich people.

A. making use of
B. account for
C. consist of
D. clean up

简述独立光伏发电系统的工作原理?

简述独立光伏发电系统的组成及组成部分的作用。

光伏发电系统是利用（）组件和配套电气设备进行发电的。

A. 太阳能
B. 风能
C. 热能