键盘、鼠标、扫描仪等属于__;显示器、打印机、绘图仪、音响等属于输出设备
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Nowadays,weutilizeGMDSS（）
A. because there are many flaws of the previous radio communication system
B. because a conference was held in 1962
C. because Telestar was put into orbit
D. A and C are all right
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