若采样频率过低，不满足采样定理，则采样离散信号的频谱会发生（）现象。
参考答案：混叠
医疗安全
In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each deparlment or division has defined its own network needs (70) OS, LAN topology, communication protocols, applications, and other components.
A．same
B．similar
C．different
D．difference
