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问题 单项选择题

MEMS的英文名称是（）

A.MECHANICAL-ELECTRO-MICROSYSTEMS

B.MICRO-ELECTRO-MECHANICALSYSTEMS

C.MICRO-MECHANICAL-ELECTROSYSTEMS

D.ELECTRO-MICRO-MECHANICALSYSTEMS

答案

参考答案：B

选择题
We _____ on this project for four hours. Let's have a rest.

A. are working
B. have been working
C. worked
D. had worked
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单项选择题

对地方病应当注意询问( )

A．家族史
B．生活经历
C．婚姻生育
D．精神情志
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