电动机在运转过程中,转子与定子发生摩擦,其原因可能是()。 A.轴承磨损,轴承端盖不

题型:单项选择题

问题:

电动机在运转过程中,转子与定子发生摩擦,其原因可能是()。

A.轴承磨损,轴承端盖不正,定子或转子铁蕊变形

B.各电刷间的电流不平衡

C.绕组与滑环间连接不良

考点:天车工考试中级天车工中级天车工题库
题型:单项选择题

急性化脓性腹膜炎、的手术指征中,错误的是()

A.弥漫性腹膜炎无局限趋势

B.观察12小时症状,体征加重

C.中毒症状明显,有休克表现

D.非手术治疗无效

E.原发性腹膜炎

题型:单项选择题
We kids have different ways to get in touch with each other now. And for the old, they’d like to go to the market or     26      each other’s houses, but for the young, we kids needn’t follow the     27     of doing so.
The easiest way for us to get in touch and make    28     is to use the Internet services, like QQ. A lot of websites such as www.qq.com have     29    in the last few years and offered such kinds of     30     for free. So we can make friends    31     through the Internet. Maybe we do not    32    all these “friend” well. We add friends only    33    we seem cooler with more friends online.
Then how do we kids keep in touch with friends online? We make it by posting our     34      to each other. At times , “friends”     35     “be missing” for months without a message. Is this the friendship in the 21st century?
Of course, using these Internet services is not     36    for saying “ Hi, what’s up?” Some of us have found long-lost classmates and friends     37    these websites. And at times we     38  a time to go to a movie or get together. What’s more, we kids can      39     our friends’ favourite music when we are on the Internet.
Believe it or not, these Internet services will be    40     for a while, and it is really a convenient way for us to keep in touch.
小题1:
A.visitB.enjoyC.likeD.build
小题2:
A.chancesB.thoughtsC.waysD.plans
小题3:
A.quarrelsB.friendsC.sentencesD.jokes
小题4:
A.goneB.hadC.turnedD.appeared
小题5:
A.computersB.servicesC.booksD.rooms
小题6:
A.easilyB.loudlyC.actuallyD.early
小题7:
A.learnB.knowC.hearD.teach
小题8:
A.ifB.whenC.becauseD.how
小题9:
A.moneyB.paperC.positionsD.messages
小题10:
A.mustB.willC.mayD.shall
小题11:
A.alreadyB.alsoC.justD.yet
小题12:
A.throughB.forC.ontoD.into
小题13:
A.spendB.killC.fixD.last
小题14:
A.listen toB.hear fromC.look atD.feel like
小题15:
A.difficultB.popularC.dangerousD.polite
题型:单项选择题

根据我国特别行政区基本法的规定,下列关于特别行政区长官任期表述中哪一选项是正确的?( )

A.特别行政区行政长官可以连任一次,但连续任职不得超过8年

B.特别行政区行政长官可以连任一次,但连续任职不得超过5年

C.特别行政区行政长官可以连任一次,但连续任职不得超过6年

D.特别行政区行政长官可以连任一次,但连续任职不得超过10年

题型:单项选择题

结构施工图中所指钢筋长度是钢筋外边缘至外边缘之间的长度,即外包尺寸。

题型:单项选择题

超声检测主要基于超声波在工件中的传播特性,如()

A.通过材料时能量衰减

B.遇异质界面反射、折射

C.斜入射的波型转换

D.以上都是

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