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问题 单项选择题

飞行预先准备阶段需要拍发的电报有：（）.

A.SITA格式的PLN报

B.AFTN格式的PLN报

C.AFTN格式的PLN报，仅限非正班

D.A和C

答案

参考答案：D

选择题

— She got her first science fiction published. It turned out to be _____.

— When was that?

— It was in 2009 _____ she was still in college.[ ]

A. success; that

B. a success; when

C. success; when

D. a success; that

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单项选择题

翼尖涡引起的在机翼翼展范围内的气流（）运动，翼展之外的气流向（）运动.

A.向上、向下

B.向上、向上

C.向下、向上
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