题目内容

Two pilots working as a team provides a sort of human _____ which reduces the workload placed on any one crew member.

A. error
B. redundancy
C. factor
D. aid

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_____, is the same as a crash landing, only on water.

A. Precautionary landing
B. Ditching
C. Forced landing
D. Belly landing

The _____ is the gentle settling of the airplane onto the landing surface.

A. landing
B. approach
C. touchdown
D. flare

用数字、文字和符号来表示各种对象和信号等信息的过程称为。

A. 数制
B. 编码
C. 位权
D. 逻辑运算

或逻辑电路的逻辑功能是：。

A. “有1出0，全0出1”
B. “有1出1，全0出0”
C. “有0出1，全1出0”
D. “有0出0，全1出1”