—Whatdidhe yesterday? —Hecleanedhisroom._爱下问搜题

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问题选择题

—What did he yesterday? —He cleaned his room.

[ ]

A. did
B. does
C. do

答案

答案：C

单项选择题

VLAN工作在OSI参考模型的 (35) 。不同VLAN之间的PC机通信时必须要借助于具有 (36) 功能的网络设备。

A．三层交换

B．通信交换

C．信元交换

D．线路交换

问答题简答题

语言接触主要有哪些类型？