CSMA/CD协议可以利用多种监听算法来减少发送冲突的概率,下面关于各种监听算法的描

题型:单项选择题

问题:

CSMA/CD协议可以利用多种监听算法来减少发送冲突的概率,下面关于各种监听算法的描述中,正确的是 ______ 。

A.非坚持型监听算法有利于减少网络空闲时间

B.I-坚持型监听算法有利于减少冲突的概率

C.P-坚持型监听算法无法减少网络的空闲时间

D.I-坚持型监听算法能够及时抢占信道

考点:计算机软件水平考试初级网络管理员初级网络管理员上午试题
题型:单项选择题

阅读下面短文,用括号内所给动词的适当形式填空。

     With a heavy bag in her hands, Alice stopped (1) ________ (have) a rest on her way to the bus station.

As she was standing by a new, bright car,which was just at the side of the road, she (2) ________ (see) a

policeman coming towards her."Excuse me, madam," said the policeman, "can you read the sign over there?"

     "Yes, of course." said Alice."It says 'No Parking'. What (3) ________ (be) the matter, sir?"

     "Well, madam. So could you tell me why you are parking your car here?"

     "But this isn't my car." said Alice.

      "I'm so sorry, madam!" said the policeman. "Er..., anyway, if the owner doesn't come soon, I

(4) ________ (put) a traffic ticket (罚单) on it..." But he couldn't finish because another woman had arrived.

     "Happy birthday, dear!" said the woman,"I (5) ________ (be) here waiting for you since 9∶40! I knew I

could catch you here this time of day! I have a surprise for you. (6) ________ (come) and see your birthday

present."

     "Thank you, dear." said the policeman."But where is it?" His wife pointed at the car."Here it is," she said,

"but you (7) ________(drive) it away at once. There's a 'No Parking' sign over there."

题型:单项选择题

当空气中硫化氢浓度超过()mg/m3时,警示现场人员撤离。

A.15

B.30

C.150

D.300

题型:单项选择题

不孕的病因可能有()、()、()。

题型:单项选择题

女性患者,32岁,每于月经期出现鼻出血,应考虑

A.再生障碍性贫血
B.白血病
C.高血压
D.子宫内膜异位症
E.鼻炎

题型:单项选择题


本大题要求判断所给出的条件能否充分支持题干中陈述的结论,阅读条件(1)和(2)后选择:
(A) 条件(1)充分,但条件(2)不充分.
(B) 条件(2)充分,但条件(1)不充分.
(C) 条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
(D) 条件(1)充分,条件(2)也充分.
(E) 条件(1)和(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.

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