简述信号不失真条件。
对一个测试装置,其输出y(t)和输入x(t)满足y(t)=A0x(t-τ0)。式中A0、τ0均为常量。则,即实现不失真测量的基本条件为A(ω)=A0=常数,φ(ω)=-τ0ω
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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