a half hour and made sure that the girl was all 84

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相似问题和答案

第1题：

The Ezonexam LAN is upgrading all devices to operate in full duplex. Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?

A．Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive

B．Full-duplex Ethernet consists of a shared cable segment. Half-duplex Ethernet provides a point-to-point link

C．Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

D．Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex ethernet uses a jam signal

E．None of the above

正确答案：C

第2题：

The ____________ shoes were covered with mud, so I asked them to take them off before they got into __________ car.

A. girl’s; Tom’s

B. girls’; Toms’

C. girls’; Tom’s

D. girl’s; Toms’

正确答案：C

第3题：

3． —How far is your cousin's home from here?

—It's about two_________ drive．

A． hour-s

B． hours

C． hours

D． hour

正确答案：C
3．C【解析】本题考查名词所有格的用法。前面有数词two，故hour先变为复数形式后，再变为名词所有格形式，two hours' drive意为“开车两小时的路程”，故选C。

第4题：

将变量hour的个位送入变量gw的语句是：（）

A．gw= hour;

B．gw=hour/10;

C．gw=hour%10;

D．gw== hour%10;

gw=hour%10;

第5题：

What are the differences between full－duplex Ethernet and half－duplex Ethernet?()

A. Half-duplex Ethernet operates in a shared collision domain.

B. Full-duplex Ethernet has a lower effective throughput.

C. Half-duplex Ethernet operates in a private collision domain.

D. Full-duplex Ethernet allows two-way communication.

E. Half-duplex Ethernet operates in a private broadcast domain.

参考答案：A, D

第6题：

When you compare the differences between half-duplex and full-duplex Ethernet, which of the following characteristics are exclusive to half-duplex? (Select two answer choices)

A．Half-duplex Ethernet operates in a shared collision domain.

B．Half-duplex Ethernet operates in an exclusive broadcast domain.

C．Half-duplex Ethernet has efficient throughput.

D．Half-duplex Ethernet has lower effective throughput.

E．Half-duplex Ethernet operates in an exclusive collision domain.

正确答案：AD
解析：Explanation:
A single device could not be sending a frame. and receiving a frame. at the same time because it would mean that a collision was occurring. So, devices simply chose not to send a frame. while receiving a frame. That logic is called half-duplex logic.

Ethernet switches allow multiple frames to be sent over different ports at the same time. Additionally, if only one device is connected to a switch port, there is never a possibility that a collision could occur. So, LAN switches with only one device cabled to each port of the switch allow the use of full-duplex operation. Full duplex means that an Ethernet card can send and receive concurrently.

Incorrect Answers:
B. Full duplex effectively doubles the throughput of half-duplex operation, because data can be both sent and received at the full 10/100 speed.

C, E. In half duplex operation, the network is shared between all devices in the collision domain.

第7题：

b)

main()

{

union{ /*定义一个联合*/

int i;

struct{ /*在联合中定义一个结构*/

char first;

char second;

}half;

}number;

number.i=0x4241; /*联合成员赋值*/

printf("%c%c\n", number.half.first,

mumber.half.second);

number.half.first='a'; /*联合中结构成员赋值

*/

number.half.second='b';

printf("%x\n", number.i);

getch();

}

正确答案：

AB (0x41 对应'A',是低位；Ox42 对应'B',
是高位）6261 (number.i 和number.half 共用一块地址空
间）

第8题：

You want to upgrade the Ezonexam LAN so that all ports operate in full duplex mode. Which statement is true about full-duplex Ethernet when comparing to half-duplex Ethernet?

A．Full-duplex Ethernet consists of a shared cable segment. Half-duplex provides a point-to-point link

B．Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive

C．Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

D．Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signal

E．None of the above

正确答案：C

第9题：

9、找出连读全部正确的一个句子。

A．Ms Black worked~ in~an~office last~yesterday.

B．She can't carry~it.

C．I called~you~ half~an~hour~ago.

D．I am fine.

She can't carry~it.

第10题：

找出连读全部正确的一个句子。

A．Ms Black worked~ in~an~office last~yesterday.

B．She can't carry~it.

C．I called~you~ half~an~hour~ago.

D．I am fine.

She can't carry~it.

a half hour and made sure that the girl was all 84

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