题目内容

This is normally accomplished by reducing the angle of attack, i.e., _____ the nose.

A. moving
B. raising
C. tipping
D. lowering

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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

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。