题目内容

在三级放大电路中,已知|Au1|=50,|Au2|=80,|Au3|=25,则其总电压放大倍数|Au|=( )。

A. 100000
B. - 100000
C. 155

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甲乙类功率放大电路,在理想情况下的最高效率能达到( )。

A. 0.25
B. 0.5
C. 0.785

_____ runways provide both horizontal and vertical guidance for instrument approaches.

A. instrument
B. visual
C. precision
D. non-precisio

Many pieces of ground equipment operate in close_____ to the fuselage and wings.

A. distance
B. area
C. factor
D. proximity

All ground damage should be checked to ensure that any of them is within_____

A. safe ranges
B. safe limits
C. safe tolerances
D. safe conditions

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