调制解调器中调制器实现的功能是
A.把模拟信号转变为数字信号
B.把数字信号转变为模拟信号
C.把模拟信号转变为音频信号
D.把音频信号转变为模拟信号
正确答案是B
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
In retirement, my father takes up painting and gardening for some ( ). (relax)