判断题

15定额墙柱面工程中墙、柱、梁零星项目勾缝按勾缝面的面积以米计算
正确
错误

答案：错误

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To amuse herself and to tease her teachers, Clara pretended to waver between Arts and Science.
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答案：正确

单项选择题

Which correlation property makes filtering white noise by autocorrelation possible?

A．When τ=0，the autocorrelation function has the maximum value
B．The autocorrelation function of a periodic signal is still a periodic signal of the same frequency, but it does not retain the phase information of the original signal
C．The autocorrelation function of the random noise signal will decay rapidly as τ increases
D．Two periodic signals with different frequencies are not correlated to each other