试题与答案

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

题目:

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

答案:

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参考答案:艺术家在创作过程中,对主体思想感情和客观生活的关系所持的基本态度和所遵循的基本规则。

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题型:填空题

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."

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