若客户在柜面注册网上银行而不申请U盾证书,我行可为客户免费赠送电子口令卡.（）
参考答案：对
不能在真空中传播的“波”是（ ）
A．声波
B．光波
C．电磁波
D．无线电波
Assume that an operating system uses a round—robin scheduler. The process's quantum is 20 msec, and the context switch is 5 msec. What percentage of the CPU's time is spent on administrative overhead ( )
A．5%
B．15%
C．20%
D．25%
