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问题 填空题

7分写成小数得______元，6厘米用分米作单位写成小数是______分米，用米作单位，写成小数是______米．1米8分米写成小数是______米．

答案

（1）7分=0.07元；

（2）6厘米=0.6分米=0.06米；

（3）1米8分米=1.8米．

故答案为：0.07，0.6，0.06，1.8．

单项选择题

滑轮组上下滑轮之间的最小净距不得小于轮径的（）倍。

A.3

B.5

C.25

D.30
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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．power

B．tights

C．authorized

D．common
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