皮皮学,免费搜题
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搜题
【单选题】
日光灯电路如下图所示,已知灯管电阻R1为480Ω,镇流器的电阻R2为30Ω,电感为1.5H,当电路加在220V、50Hz的交流电压后,镇流器两端的电压U2=()
A.
149.6V
B.
211V
C.
97.6V
D.
179.3V
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举一反三
【判断题】零序电流保护的逐级配合是指零序电流保护各段的时间要严格配合。
A.
正确
B.
错误
【判断题】理论创新是人类对事物和认识对象的现象与本质,规律与变化所作的揭示和概括,是认识的深化,拓展与升华。判断对错
A.
正确
B.
错误
【判断题】所谓逻辑,就是人对自然事物和社会事物的认识,是人给对象事物赋予的含义,是人类以符号形式传递和交流的精神内容。( )
A.
正确
B.
错误
【单选题】1 Computer people talk a lot about the need for other people to become 'computer- literate', in other words, to learn to understand computers and what makes them tick. Not all experts agree, however, ...
A.
train people to understand how computers work.
B.
make more computers available to people.
C.
enable more people to fix computers themselves.
D.
help people find out more about computers.
【单选题】--I wonder if I could use your computer tonight.--_________. I’m not using it right now.
A.
Sure, so ahead.
B.
I don’t know.
C.
It doesn’t matter.
D.
Who cares?
【单选题】I'm busy at the moment. ______ on the computer.
A.
I work
B.
I'm work
C.
I'm working
D.
I working
【多选题】下列关于工程建设缺陷责任期确定的说法正确的有()。
A.
缺陷责任期一般从工程通过竣(交)工验收之日起计
B.
工程保修期结束,方可申请返还质量保证金
C.
发包人导致竣工延迟的,在承包人提交竣工验收报告后90天后,自动进入缺陷责任期
D.
主体结构工程的缺陷责任期为设计文件规定的该工程的合理使用年限
E.
承包人导致竣工迟延的,缺陷责任期从实际通过竣工验收之日起计
【单选题】听力原文:M: Where can I buy a computer? It doesn't have to be the best on the market. I'm just going to use it to do word-processing. W: You could go to a computer store, or a discount store, but if I wer...
A.
To buy the computer at a discount store.
B.
To put an ad in the newspaper for a computer.
C.
To go to a computer store to buy the computer.
D.
To buy the computer at the university as a special offer.
【判断题】思想意识是人脑对客观事物的反映,所以说人类只能认识现存的事物,对尚不存在的事物和观念是无法预测的。()
A.
正确
B.
错误
【判断题】所谓意义,就是人对自然事物和社会事物的认识,是人给对象事物赋予的含义,是人类以符号形式传递和交流的精神内容。( )
A.
正确
B.
错误
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