局域网中应用最广泛的差错控制方法是 (47) 校验。在CRC校验中

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问题单项选择题

局域网中应用最广泛的差错控制方法是 (47) 校验。在CRC校验中，假设采用的生成多项式为四阶多项式，它产生的校验码为 (48) 位。在接收端，若发现错误，则将采取 (49) 措施。

A．2

B．4

C．8

D．16

答案

参考答案：B

补全对话，情景问答

补充对话 (每空一词)。

A: Let's play __1__ , OK?

B: Sorry, I don't have a volleyball. __2__ I have a basketball.

A: I __3__ want to play basketball. I only want to play volleyball.

B: Who__4__ a volleyball?Do you know?

A: Maybe Tom has one. Let's go and ask him.

A and B: Hi, Tom, __5__ you have a volleyball?

C: No, I __6__ .__7__ Peter have one?

A and B: Oh, yes , he __8__ .

A, B and C: Hi, Peter! Do you have a volleyball?

D: Yes, I do. __9__ is here.

A B and C: Let's play volleyball, OK?

D: OK! __10__ go!

填空题

今天早上我起床后看到我家的猫在我床上。