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【单选题】第二篇 Sleep We all know that the normal human daily cycle of activity is of some 7 - 8 hours’ sleep alternating with some 16 - 17 hours’ wakefulness and that, broadly speaking, the sleep n...
A.
people hate the inconvenience of working on night shifts.
B.
your life is disturbed by changing from day to night routines and back.
C.
not all industries work at the same hours.
D.
it is difficult to find a corps of good night workers.
【单选题】日立HT-3842的DE board主板的功能是（）
A.
上部单元驱动控制板
B.
将+36V转换为+5V，-15V，+15V
C.
整个机芯控制板
D.
与PC交换信息时，进行数据鉴证
【单选题】下列有关PC机主板的叙述中,错误的是（）。
A.
主板的物理尺寸没有标准,各厂家均可自行定义
B.
主板上包含芯片组,它是PC机各组成部分相互连接和通信的枢纽
C.
主板上包含BIOS和CMOS芯片
D.
主板上包含CPU插座、内存条插槽及其它类型的插槽