问题
单项选择题
Modern computers are electronic and (66) devices. The basic building block of a modem computer is a (67) .
A．chip
B．tube
C．transistor
D．switch
答案
参考答案：A
解析： 略
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Modern computers are electronic and (66) devices. The basic building block of a modem computer is a (67) .
A．chip
B．tube
C．transistor
D．switch
参考答案：A
解析： 略
