660V供电系统中,电动机有三角形错接成星形,电动机输出功率会()。A、减小B、增大

题型:单项选择题

问题:

660V供电系统中,电动机有三角形错接成星形,电动机输出功率会()。

A、减小

B、增大

C、不变

考点:综采维修电工综采维修电工(综合练习)综采维修电工(综合练习)题库
题型:单项选择题

阅读理解。

     It was just three degrees above zero. "That's cold," thought Jane as she got ready to deliver (送) her

morning papers. Jane had 50 customers (订户), and on cold mornings when she couldn't ride her bicycle,

it took her more than an hour to make her rounds.

     As she collected her papers and put them into a big canvas bag, Jane regretted (遗憾) that she hadn't

finished her math homework the night before. There was still time. She'd hurry with the papers and finish

the math before breakfast.

     Less than an hour later Jane was nearly finished. She had only five customers to go. She could then

bead for home to complete her math while her mom made breakfast. As she rounded the corner, she saw

a car in the middle of the street. It was Mr. Zimmerman, the elderly man who walked with a walking stick.

His car was out of gas (汽油).

     "I'd like to help Mr. Zimmerman," thought Jane, "but if I do, I won't have time to do my homework."

She hated to think what Mr. Roberts would say if she hadn't finished her papers.

     "It's his own fault (过错) for running out of gas," Jane talked to herself. "The station is only a half mile

down the street. Surely Mr. Zimmerman can walk that far, even on a cold morning like this … can't he?"

As she walked down the street, Jane wondered what to do.

1. Jane delivers her papers _____.

A. before she goes to school

B. on cold mornings

C. with the help of Mr. Zimmerman's car

D. on the way to school

2. Mr. Zimmerman was old and _____.

A. couldn't drive well

B. would have nobody to help him

C. was not rich enough to buy enough gas

D. was not able to walk a long way

3. The best title for this reading should be _____.

A. Fifty Customers

B. There's No Easy Answer

C. No Time to Finish Homework

D. A Cold Morning for Jane

4. We know from the reading that _____.

A. Jane couldn't find any time to finish her homework

B. it took about an hour for Jane to send the papers

C. Jane would have her breakfast in the school

D. Jane liked to deliver papers on cold mornings

5. The reading doesn't say but we can infer that _____.

A. Jane bought the gas for Mr. Zimmerman

B. usually Jane would deliver papers by bike

C. Mr. Robert didn't' like Jane at school

D. Mr. Zimmerman had to leave the car for Jane

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甲午战争后的“公车上书”与巴黎和会时的五四运动都是爱国救亡运动,但两者的规模与影响差别甚大,其主要原因在于

A.民族觉醒程序与群众基础不同

B.外交失利导致的损害程序不同

C.大众传媒发展水平与方式不同

D.列强攫取中国利权的手段不同

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在我国会计信息化发展过程中,适应会计准则制度的发展要求引入会计专业判断的阶段为()。

A.探索起步阶段

B.渗透融合阶段

C.推广发展阶段

D.集成管理阶段

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怎样立遗嘱?立遗嘱需注意哪些问题?

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输血完毕后,医护人员可将血袋直接丢入医疗垃圾中。

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