题目内容

The _____ of advanced warning systems and effective crew training has made gear-up landing accidents in large aircraft extremely rare.

A. combination
B. correlation
C. compensation
D. collection

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In the event of failure of power system, an emergency extension system is always _____.

A. adjustable
B. available
C. advisable
D. adaptable

In case the power system fails, pilots may manually operate a _____ or pump to extend the landing gear.

A. crank
B. brake
C. actuator
D. torque

A mechanical free-fall mechanism can disengage the_____.

A. strut
B. downlocks
C. shaft
D. uplocks

It is _____ in mechanical free-fall mechanism that forces the landing gear to fall.

A. facility
B. activity
C. gravity
D. variety