简单邮件传送协议(SMTP)的默认端口号是
A.21
B.23
C.25
D.27
正确答案是C
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上一篇:Complete the following sentence with a (compound) word derived from the one(s) given in bracket. Write your word on the answer sheet.Many people think that we have more natural resources than we need, but this is not ( )true. (necessary)
Complete the following sentence with a (compound) word derived from the one(s) given in bracket. Write your word on the answer sheet.
Many people think that we have more natural resources than we need, but this is not ( )true. (necessary)
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