IP172.16.40.1-172.16.40.255，要划若干个子网，每个子网里要

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问题单项选择题

IP172.16.40.1-172.16.40.255，要划若干个子网，每个子网里要有32台机器，请算出掩码？（）

A.255.255.255.192

B.255.255.255.224

C.255.255.255.240

D.255.255.255.248

答案

参考答案：A

选择题

—_____ you _____ Kate’s letter yet?

—Yes. I _______ it for several days.[ ]

A. Did…receive, have received

B. Did… receive, have had

C. Have… received, have received

D. Have received, have had

单项选择题

测量温度越高，同一组双金属片的自由端产生的角位移量（）。

A、越大

B、越小

C、不变

D、不确定