激光测云仪测云高，测云仪仰角为30°，电子门开放到关闭的时间间

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问题单项选择题

激光测云仪测云高，测云仪仰角为30°，电子门开放到关闭的时间间隔为1³10-5秒，则云高为（）。

A.1500

B.3000

C.750

D.1000

答案

参考答案：C

选择题

Ladies and gentlemen, please remain ________ until the plane has come to a complete stop.

A．seated

B．seating

C．to seat

D．seat

选择题

It was only when I read this story for a second time _____ to appreciate its beauty. [ ]

A. did I begin

B. that I began

C. then I began

D. had I begun