搜题请搜索小程序“爱下问搜题”
问题 选择题

Beijing is one of the               in the world today.         [ ]

A. busiest city    

B. busiest cities    

C. busy city        

D. busy cities

答案

答案：B

单项选择题

The standard (IEEE 802)format for printing （） in human-friendly form is six groups of two hexadecimal digits，separated by hyphens(-) or colons(:)，in transmission order, e.g.01-23-45-67-89-ab，01:23:45:67:89:ab．This form is also commonly used for EUI-64.

A．hard disk logical block address

B．IP address

C．mail address

D．MAC address
查看答案
多项选择题

连续性硬膜外镇痛的并发症包括()

A．误入蛛网膜下隙

B．呼吸抑制

C．硬膜外血肿

D．椎管内感染

E．尿潴留
查看答案