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4.The smarter the manufacturing process, the (quick)_____it can respond to the changing customerdemand.

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5.They were asked to view some videos before (attend)_____the training course.

振动频率的单位是( ):

A. Hz
B. s
C. ms
D. μs

以人的可感觉频率为分界线,则超声波为( )的声波:

A. f<20Hz;
B. 20Hz ≤f ≤ 20kHz
C. > 20kHz
D. f>20kHz或者f<20Hz

采样间隔越短,模拟信号的重构效果( ):

A. 越好
B. 越差
C. 没有影响