题目内容

Planting trees help improve and ____the environment.

A. beautiful
B. beautify

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He talked of other cultures as if they were more__________to him than hisown

A. familiar
B. familiarize

According to the________figures, over one thousand people died during therevolution

A. offer
B. official

日照传感器的核心部件是3个( )。

A. 热敏电阻
B. 热电偶
C. 光电感应器件
D. 透明玻璃罩

当直接辐射大于等于( )W/m2时,日照传感器输出相应电平表示有日照信号。

A. 40
B. 120
C. 1000
D. 1200