______是指系统资源受到破坏或变得不能使用。

发布时间：2018-04-10 09:37 │ 来源：www.tikuol.com

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问题：

______是指系统资源受到破坏或变得不能使用。

考点：计算机等级考试网络技术三级网络技术笔试350

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跨径25m、桥宽12m的装配式T梁桥采用杠杆原理法计算活载跨中横向分配系数。 ( )

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       Bill is fifteen now, but he's still in Grade One. He likes   1   and does not like to
use his   2 .He does not listen to the teachers in class and so he   3   his homework  His teachers do not
like him  They tell his parents about it,  but they do not   4_ what to do.
       It s Sunday today. Bill _5_ early in the morning. After breakfast,  his mother tells him to do his   6_.
He goes to his study. His mother is   7   with her housework.
Bill goes out with a ball. Now lunch is ready, but she   8  Bill. When Bill comes back,
his parents look very angry, but say nothing.
       After lunch Bill wants to go out again. His father stops him and asks,   "Have you finished your
homework? "
       "No,"answers the boy, "I can't do   9    ."
       His father pulls( 拉 ) him by the ear ana says,"   10   your ear? "
       "Oh,dear!  " Bill calls out ,"It's in your hand!

( )l. A. playing football
( )2. A. hand
( )3. A. can do
( )4. A. have
( )5. A. get up
( )6. A. homework
( )7. A. busy
( )8. A. canfind
( )9. A. they
( )l0. A. Where

B. to play the football
B. pen
B. can not do
B. think
B. gets up
B. homeworks
B. does
B. finds
B. them
B. Where's

C. playing the football
C. head
C. don't
C. know
C. stands up
C. housework
C. like
C. can'tfind
C. it
C. What

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彩虹是悬浮于空气中的大量小水珠对阳光的色散造成的，如图所示为太阳光照射到空气中的一个小水珠发生反射和色散的光路示意图，其中a、b为两束频率不同的单色光．对于这两束光，以下说法中正确的是（）

A．单色光a比单色光b的频率高

B．由水射向空气，a光发生全反射的临界角大于b光发生全反射的临界角

C．在水中a光的传播速度小于b光的传播速度

D．如果b光能使某金属发生光电效应，则a光也一定能使该金属发生光电效应

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校对千分尺零位时，微分筒上的 ___ 应与固定套筒的 ___ 为准，微分筒垂直的 ___ 应与固定套筒的 ___ 相切。

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在自然状态下，难于对缺素症判断的原因。

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