题目内容

There is, of course, a limit to how far the angle of attack can be increased, if a _____ is to be avoided.

A. acceleration
B. stall
C. deceleration
D. failure

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Lift and drag also vary directly with the _____ of the air.

A. concentration
B. density
C. intensity
D. condition

Warm air is less dense than cool air, and _____ air is less dense than dry air.

A. humid
B. wet
C. moist
D. damp

公路定线一般有纸上定线、( )定线和航测定线三种方法。

实地放线的主要工作是将初测时的()路线设到地面上。