判断题

运动强度越大,带来的健康效益越大。
正确
错误

答案：错误

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活动支座要保证主梁在支承处能够水平移动

答案：正确

单项选择题

A class B push-pull amplifier _______.

A．conducts through 180° of the input waveform
B．conducts between 180° and 360° degrees of the input waveform, depending on the amount of dc bias
C．conducts through less than 180° of the input waveform
D．works only with digital and pulsed waveforms