A bilingual speaker often uses two languages alternatively during a conversation with another bilingual speaker, a speech situation known as________. A: discourse role-switching B: activity role-switching C: social role-switching D: code-switching

类别转换(class switching)]

Which of the following is not the role of high-voltage circuit breaker ? ( ) A: Switch on and off various load circuits under normal conditions B: Automatically and quickly switch off the fault current under fault conditions C: Realize the function of automatic reclosing D: Switching voltage level

报文交换（message switching）无需进行报文拆分与重组，因此比分组交换（packet switching）效率高。

As visual channels, ____________is often underestimated. A: the role of presenter B: the role of audience C: the role of body language D: the role of slides

Windows Azure计算服务中应用程序包括 A: SQL存储实例、Worker Role实例，VM Role实例 B: Web Role实例、Worker Role实例，SQL存储实例 C: Web Role实例、Worker Role实例，VM Role实例 D: Web Role实例、SQL存储实例，VM Role实例

删除角色使用的命令是（） A: delete role B: drop role C: alter role D: evoke role

The transistor inside the switching regulator works in a linear state. A: Correct B: Wrong

After having switched off the mains separator, wait for ___________ before switching it back on.

OpenStack认证服务使用命令行方式创建角色的配置命令是( )。 A: openstack role add B: openstack role set C: openstack role create D: openstack role list