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问题 填空题

传感器的外部供电方式包括（）和集中供电两种。

答案

参考答案：就近供电

选择题
The professor could hardly find sufficient grounds ______ his arguments in favor of the new theory.

A. on which to base
B. which to base on
C. to base on
D. to be based on
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单项选择题

某班期末考试语文平均成绩为75分，标准差为8分，小明得92分，则小明的标准分数是

A．1.12

B．1.37

C．2.13

D．6.52
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