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问题 单项选择题

STM-1的速率是( )。

A．2.048Mbps

B．64kbps

C．622.080Mbps

D．155.520Mbps

答案

参考答案：D

解析： SDH最基本也是最重要的模块信号是STM-1，速率是155.520Mbps。

问答题 简答题

简述外科感染的演变与转归。
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单项选择题

"Culture shock" occurs as a result of total immersion in new culture. It (51) to "people who have been suddenly transplanted abroad. " Newcomers may be anxious (52) they do not speak the language, know the (53) , or understand people’s behavior in daily life. The visitor finds that "yes" may not always mean "yes", that friendliness does not (54) mean friendship or that statements that appear to be serious are really intended (55) jokes. The foreigner may be unsure as to when to shake hands or embrace, when to (56) conversations, or how to approach a stranger. The (57) . of "culture shock" helps explain feelings of bewilderment and disorientation. Language problems do not account for all the frustrations that people feel. When one is (58) of everything that was once familiar, such as understanding a transportation system, knowing how to register for university classes, (59) knowing how to make friends, difficulties in coping with the new society may (60) .

51（）。

A. occurs

B. appears

C. happens

D. exists
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