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问题 单项选择题

检查屋面有无渗漏、积水和排水系统是否畅通，应在雨后或持续淋水2h后进行。有可能作蓄水检验的屋面，其蓄水时间不应少于( )h。

A．6

B．12

C．24

D．36

答案

参考答案：C

单项选择题 A1/A2型题

在渗出液的特点中，积液LD与血清LD的比值大于多少（）

A.0.2

B.0.1

C.0.6

D.0.4

E.0.3
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单项选择题

Most computer systems are (16) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (17) to an outsider attack by preventing.
(18) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (19) users. Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment, but also helps to prevent future attacks. These attacks are usually (20) by tools referred to as Intrusion Detection Systems.

A．searched

B．checked

C．tested

D．detected
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