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问题 单项选择题

镜圈的垂直高度为36mm，测量光学中心高度为20mm，问：垂直移心量是多少？向哪个方向移心？（）

A．上移2mm

B．下移2mm

C．上移4mm

D．下移4mm

答案

参考答案：B

选择题

—How can I learn more about computer science?

—You can learn by _____ questions. [ ]

A. asked

B. asking

C. be asked

D. ask

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选择题

— Could you tell me ______? 

— Of course. He is my good friend Wang Le. [ ]

A. who is the boy in a green T-shirt

B. who the boy in a green T-shirt is

C. who was the boy in a green T-shirt

D. who the boy in a green T-shirt was

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