单项选择题
A.DM B.1DM C.LM D.IOAM
A.ASCII B.GRPC C.GPB D.GBK
A.exit with 0 B.exit with 1 C.exit with -1028498 D.exit with 1829278
A.after(5) B.after(5000) C.sleep(5) D.sleep(5000)
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