一台三相变压器联结组别为Ynyn0d11,那么零序阻抗应该测量4回。()

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问题:

一台三相变压器联结组别为Ynyn0d11,那么零序阻抗应该测量4回。()

考点:电气工程公共基础第三节电动机与变压器第三节电动机与变压器题库
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“市场与计划二者就像鸟与笼子的关系一样,要让鸟飞,但只能在笼子里飞,否则鸟就飞跑了。如果鸟是搞活经济的话,那么笼子就是国家计划。搞活经济、市场调节,只能在计划许可的范围内发挥作用,不能离开计划的指导。”上述说法与我国哪一时期的经济政策最为吻合?

A.20世纪60年代

B.20世纪70年代

C.20世纪80年代

D.20世纪90年代

题型:判断题

阅读理解。

     CBC is a famous air company which has over twenty planes carrying passengers and goods, flying

along 12 fixed lines all over the world. Its service is very good but some passengers are still not satisfied

with it and that is why in 1998 and 1999 the company received letters of complaints(投诉) from consumers

or passengers who pointed out over a dozen kinds of problems which are divided in groups in the following

table. This division is called Category. Problems that appear when the plane is flying are Flight problems.

Those about passengers' things carried by the plane are Baggage problems. Customer service refers to

service work which passengers are not satisfied with. Over sales of seats are about the fact that more seats

are sold and as a result the plane is too crowded to be safe. Refund problems appear when passengers fail

to receive the money paid to them because of what they have lost. Fares are problems about the price of

tickets. Reservations are problems that appear when passengers could not get the tickets they have already

booked. Tours are problems about the passengers'traveling by air or hotel problems. Advertising is what the

passengers think about advertisement on the plane. Credit problems are about the use of credit cards.   

          ONSUMER COMPLAINTS RECEIVED BY THE CBC   

Category                 1998    1999                                                                                             (percent)  (percent)   

Flight problems…………………………………   20.0%    22.1%   

Baggage …………………………………………  18.3%    21.8%   

Customer service ………………………………   13.1%    11.3%   

Over sales of seats ……………………………… 10.5%    11.8%   

Refund problems ………………………………   10.1%     8.1%   

Fares ……………………………………………   6.4%      6.0%   

Reservations and ticketing ………………………  5.8%      5.6%   

Tours ……………………………………………  3.3%    2.3%   

Smoking …………………………………………  3.2%      2.9%   

Advertising ………………………………………  1.2%    1.1%   

Credit ……………………………………………  1.0%      0.8%   

Special passengers ………………………………  0.9%      0.9%   

Other ……………………………………………   6.2%      5.3%   

Total                     100.%      100.%    

Total Number of Complaints               22,988    13,278 49

1. About how many complaints concerning Credit were received by the CBC in 1998? [ ]

A. 133   

B. 220   

C. 230   

D. 1,220

2. By about what percent did the total number of complaints decrease from 1998 to 1999?[ ]

A. 40%   

B. 60%   

C. 75%   

D. 100%

3. Which of the following statements or sayings can be inferred from the table? 

    I. In 1998 and in 1999, complaints about Flight problems, Baggage, and Customer service together took

        more than 50 percent of all consumer complaints received by the CBC Company.  

    II. The number of Special passenger complaints was unchanged from 1998 to 1999.

    III. From 1998 to 1999 the number of Flight problem complaints increased by more than two percent. [ ]

A. I only   

B. II only   

C. I and II only   

D. I and III only

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氨基甲酸酯类农药中毒抑制胆碱酯酶活性的机制是()

A.与胆碱酯酶分子结合

B.使胆碱酯酶活性丧失

C.与胆碱酯酶磷酰基结合

D.使胆碱酯酶水解

E.使胆碱酯酶活性老化

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运行中,列车工作人员不得在()洗脸间洗漱。

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SXB型巡测仪表报警器的作用是为出现参数越限时进行______和______报警。

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