单项选择题

Amplifier ac input and output voltages are ______.

A．always 180° out of phase
B．180° out of phase in all but one amplifier configuration
C．in phase in all but one amplifier configuration
D．always in phase

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单项选择题

暖空气北上、冷空气南下的热量交换方式称为（）。
A.湍流
B.平流
C.辐射
D.对流

单项选择题

In order to properly design a beam, it is import to know the variation of ( ) and ( ) along its axis in order to find the points where these values are a maximum.

A．the shear, bending moment
B．the axial force, torsional moment
C．the shear, torsional moment
D．the axial force, bending moment

Amplifier ac input and output voltages are ______.

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暖空气北上、冷空气南下的热量交换方式称为（ ）。 A.湍流 B.平流 C.辐射 D.对流

In order to properly design a beam, it is import to know the variation of ( ) and ( ) along its axis in order to find the points where these values are a maximum.

暖空气北上、冷空气南下的热量交换方式称为（）。
A.湍流
B.平流
C.辐射
D.对流