求如图所示的交变电流的有效值,其中每个周期的后半周期的图象为半个周期的正弦曲线(

题型:选择题

问题:

求如图所示的交变电流的有效值,其中每个周期的后半周期的图象为半个周期的正弦曲线(   )

A.5A

B.5A

C.5/2A

D./2A

考点:交变电流的周期和频率交变电流的最大值、有效值、瞬时值和平均值
题型:选择题

下列关于工程变更的说法中正确的是( )。

A.如果计划完整,工程变更可以避免

B.工程变更包括工程量变更、工程项目变更、进度计划变更、施工条件变更等

C.一旦出现变更,工程量、工期、成本不一定发生变化

D.工程变更不能作为施工成本控制的依据

题型:选择题

阅读理解。

     The more women and minorities make their way into the ranks of management, the more

they seem to want to talk about things formerly judged to be best left unsaid.

     Consider the novel views on the subject of getting ahead.Coleman is black.He spent 11

years with IBM, half of them working in management development, and now serves as a

consultant to the likes of AT & T, Coca Cola.Coleman says that based on what he's seen at

big companies, he weighs the different elements that make for long term career success as

follows: performance counts a mere 10%; image,30%; and exposure, a full 60%.Coleman

concludes that excellent job performance is so common these days that while doing your work

well may win you pay increases, it won't secure you the big promotion.He finds that advancement

more often depends on how many people know you and your work, and how high up they are.

     Ridiculous beliefs? Not to many people, especially many women and members of minority races

who, like Coleman, feel that the scales have dropped from their eyes."Women and blacks in

organizations work under false beliefs," says Kaleen Jamison, a New York based management

consultant who helps corporations deal with these issues."They think that if you work hard, you'll get

ahead and someone in authority will reach down and give you a promotion." She added, "Most women

and blacks are so frightened that people will think they've gotten ahead because of their sex or color

that they play down their visibility." Her advice to those folks: learn the ways that white males have

traditionally used to find their way into the spotlight.

1.The best title for this passage would be________.

A.The Importance of Being Visible

B.Roles of Women and Minorities in Management

C.Job Performance and Advancement

D.Sex and Career Success

2.To achieve success in your career,the most important factor, according to the passage, is to_______.

A.work as a consultant to your superiors

B.project a favorable image to the people around you

C.let your superiors know how good you are

D.perform well your tasks given by your superiors

3.The reason why women and blacks play down their visibility is that they________.

A.know that someone in authority will reach down and give them a promotion

B.don't want people to think that their promotions are due to sex or color

C.don't want to give people the impression that they work under false beliefs

D.believe they can get promoted by reason of their sex or color

4.In the author's opinion, Coleman's beliefs are________.

A.biased  

B.popular

C.superficial  

D.insightful

题型:选择题

德国古典哲学是马克思主义哲学的直接理论来源。 ( )

题型:选择题

在气压盾构施工中严禁将()带入气压施工区。

A.化学物品

B.易燃、易爆物品

C.有腐蚀物品

D.有害物品

题型:选择题

检修活板门的高度最小不得小于()M,宽度不得大于0.35M。

A、0.50

B、0.80

C、1.40

D、1.80

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