从功角特性看,为了不导致“失步”,同步发电机的功率角应小于()度。 A.30 B.9

题型:单项选择题

问题:

从功角特性看,为了不导致“失步”,同步发电机的功率角应小于()度。

A.30

B.90

C.120

D.180

考点:船舶电气设备及系统船舶电气设备及系统题库
题型:单项选择题

Greg Woodburn, a student at the University of Southern California, spends a lot of time cleaning sneakers he collected. But soon the shoes will be sent to poor children in the United States and 20 other countries, thanks to Woodburn’s Share our soles (S.O.S) charity.

A high school track star in the town of Ventura, California, Woodburn was treated in hospital for months with foot injuries.

“I started thinking about the health benefits, the friendship and the confidence I got from running,” he says, “And I realized there are children who don’t even have shoes”.

Woodburn gathered up his old sneakers, and then asked his friends to donate. His goal was to have 100 pairs by Christmas 2006. When he collected more than 500 pairs, he decided to turn the shoe drive into a year-round effort.

Back then, the sneakers came from donation boxes and the local sporting goods store and from door-to-door pickups. Woodburn has now set up collection boxes at two high schools, city gym and recreation center. So far, S.O.S has collected and donated more than 3,000 pairs.

Woodburn has cleaned all the shoes. After sorting the shoes by size, Woodburn selects the good shoes for the washing machine and the worn-out ones for recycling.

For many recipients, the shoes represent opportunity. Two young boys in Southern California attended school every other day because they shared a pair of shoes. They were too big for one boy and too small for the other. Thanks to S.O.S, each brother received his own pair of shoes. The boys now attend school daily and enjoy their learning. When they graduate, they say, they will help a stranger, just as Woodburn helped them.

小题1:The text is mainly about    .

A.the attempts to collect sneakers

B.the school track star, Woodburn

C.Woodburn and his Share Our Soles

D.the recycling of the worn sneakers小题2:What caused Greg Woodburn to donate old shoes for poor children?

A.News about some poor children.

B.The benefits from playing sports.

C.His memory of school life.

D.The medical treatment he received.小题3:When collecting more sneakers than expected. Woodburn decided to      .

A.collect shoes throughout the year

B.set up branches in different cities

C.put out a call to his friends

D.make his effort in the whole city小题4:From the fifth paragraph we can learn that       .

A.Woodburn has changed his business

B.Few students are interested in his suggestion

C.Few people supported his career

D.Woodburn succeeded in this charity小题5:Which of the following is true according to the passage?

A.The two brothers would like to share a pair of shoes.

B.The shoes will protect poor children from injuries.

C.Woodburn gets tired of cleaning the old sneakers.

D.The shoes from S.O.S make a big difference to the two brothers.

题型:单项选择题

我国外汇牌价的标价方法为直接标价法。( )

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A.贡献 

B.发展

C.市场 

D.利益

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