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【单选题】
在下列有关CPU 的叙述中,错误的是A.
CPU 的主要组成部分有运算器、控制器和寄存器组
B.
CPU 的主要功能是执行指令,不同类型CPU 的指令系统通常有所不同
C.
为了加快运算速度,CPU 中可包含多个算术逻辑部件(ALU )
D.
目前PC 机所用的CPU 芯片均为Intel 公司的产品
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【多选题】Why is full-duplex Ethernet superior to its single-duplex counterpart? (Select two answer choices.)
A.
It uses inexpensive hubs
B.
It operates without collisions
C.
It operates on switches
D.
It provides faster data transfer
E.
It utilizes fewer wiring pairs
【简答题】验电的步骤和要求是什么?
【简答题】对于有复验要求的元件还应该进行（ ）等复验。
【单选题】The bank clerk listened carefully he could discover exactly what the client wanted.
A.
in case that
B.
now that
C.
so that
D.
provided that
【单选题】当大风停下了,孩子们又出来玩了。
A.
The winds stopped, the children came out to play again.
B.
When the winds stopped, the children came out to play again.
C.
While the winds stopped, the children came out to play again.
【多选题】Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?（）
A.
Full-duplex Ethernet uses CSMA/CD to prevent collisions.
B.
Half-duplex Ethernet uses a loopback circuit to detect collisions.
C.
A full-duplex Ethernet card allows 20Mbps for data transmission.
D.
Full-duplex Ethernet makes use of two pairs of wires for data.
E.
An Ethernet hub can operate both half and full duplex simultaneously.
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