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问题 填空题

ATM层类似于 【12】 层协议。

答案

参考答案：数据链路

解析： ATM层类似于数据链路层协议。

选择题
In the conference room on the fifth floor, where a meeting _____, some students were busily setting the table.

A. was to be held
B. has been held
C. will be held
D. is being held
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单项选择题

职业安全健康()的目的是制定和实施职业安全健康计划，确保职业安全健康目标的实现。

A.目标

B.管理方案

C.运行控制

D.应急预案
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