直流电动机滚动轴承发热的主要原因有（）等。A、电刷架位置不对B、电动机受潮C、轴承变

发布时间：2017-09-03 07:59 │ 来源：www.tikuol.com

题型：单项选择题

问题：

直流电动机滚动轴承发热的主要原因有（）等。

A、电刷架位置不对

B、电动机受潮

C、轴承变形

D、轴承磨损过大

考点：中级维修电工中级维修电工题库

题型：单项选择题

完形填空。

      When someone asks me what business I am in. My face feels 1______. I envy (嫉妒) people who can say
that they are writers, bookkeepers or doctors.
      I really do make a living by 2______. I can laugh like a king or like a school boy. It is a skill (技能) that I
have learned, 3______ the skill of making shoes. Whenever and however laughter (笑声) is needed, I am asked
to do 4______. I laugh like a bus driver or a shopkeeper. I laugh 5______, kindly and happily.
      I hardly point out that a 6______ of this kind is tiring (辛苦的). I spend most evenings in nightclubs. My
job is 7______ laugh during the weaker part of the show. My loud laughter must be timed (合节拍) carefully. It
must not come too soon, but neither must it be too late.
      I go through life quietly. I 8______ copy the laughter of others. I can laugh 9______ many different ways,
but I'm not sure that I have ever heard the sound of 10______ own laughter.

( ) 1. A. warm
( ) 2. A. laughing
( ) 3. A. at
( ) 4. A. one
( ) 5. A. gladly
( ) 6. A. work
( ) 7. A. to
( ) 8. A. may
( ) 9. A. for
( ) 10. A. their

B. cool
B. writing
B. to
B. it
B. sadly
B. life
B. /
B. might
B. of
B. my

C. hot
C. speaking
C. by
C. those
C. truly
C. business
C. and
C. can
C. in
C. her

D. cold
D. working
D. like
D. these
D. suddenly
D. job
D. for
D. should
D. with
D. his

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题型：单项选择题

家庭病床收治的范围不包括下列哪项

A．手术后恢复期

B．病情适合在家疗养

C．肢体功能恢复期

D．行动不便就诊困难者

E．病情不稳反复发作的患者

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很多科学家认为，北极周围形成的大量参差不齐的冰将在2030年夏季完全消失(甲图)。科学家借助卫星图证实，南极一巨大冰川从冰架上断裂入海(乙图)。据此完成问题。

小题1:图示现象出现的主要原因最可能是(　　)

A．臭氧层破坏

B．酸雨

C．冰川运动

D．全球变暖小题2:针对该现象发生的主要原因，我们人类应采取的对策是(　　)

①植树造林　②控制酸性气体排放　③发展新能源、节能技术等　④减少氟氯烃等对臭氧层的破坏　⑤改善能源结构，控制温室气体排放

A．①②③

B．①③⑤

C．②③④

D．③④⑤

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题型：单项选择题

胆汁淤积性黄疸的实验室检查，叙述错误的是

A．TB增加

B．CB正常

C．CB/TBS 50%～60%

D．尿胆红素＋＋

E．尿胆原减少或消失

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题型：单项选择题

室外环境空间的组成部分

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