有一功率P为400kW的负载,功率因数cosφ为0.8,试求该负载在t=0.25h内

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问题:

有一功率P为400kW的负载,功率因数cosφ为0.8,试求该负载在t=0.25h内所消耗的电能A、视在功率S和无功功率Q各为多少?

考点:变电检修工考试变电检修初级工变电检修初级工题库
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Ibrahim became disabled after contracting polio (小儿麻痹症) when he was three years old. At first his parents, like many other parents of disabled children in Niger, did not want to send him to school. They were worried he would be laughed at by his classmates.  

Despite his disability, and his parents’ doubts, Ibrahim was determined to go to school. “When I was eight,” Ibrahim says, “other kids of my age were going to school while I stayed at home. I did not like that. So, I pestered (缠着) my parents until they finally let me go to school.”

Ibrahim’s parents sent him to a private school nearby. Although the journey to and from school was a short one, it still wasn’t easy for Ibrahim. He had to use his hands to help him move along, protecting them with plastic slippers. But at least he was getting an education.

However, after only a year in school, Ibrahim’s education was interrupted when his parents separated. His mother did not have the means to continue paying for his tuition.

In 2007, Ibrahim received some money to be fitted with a leg brace (支架), corrective shoes and his first pair of crutches (拐杖). Now that he was more mobile than before, the most important thing for him was to find a way to go back to school. 

“I wanted to start school again last October,” Ibrahim says. “After my mother told me she could not afford it, I went to visit some of my relatives for support. And I collected 5,000 francs CFA (US $8) to pay my tuition for half a year. I will find the rest of the money somehow.”

Ibrahim attends a school in which he is the only disabled student. According to his teacher, he is among the top five students in a class of 55.

小题1:Why did Ibrahim’s parents prefer Ibrahim to stay at home? 

A.There was a lot of housework for him to do.

B.They had no money to pay for his tuition.

C.There were not enough schools in the country.

D.They were afraid the students would make fun of him.小题2:How did Ibrahim go to school before his parents separated? 

A.He went to school on his wheelchair.

B.He went to school on his parents’ bicycle.

C.He walked to school with the support of his hands.

D.He walked to school using a pair of crutches.小题3: Ibrahim’s education was interrupted because of his _____.

A.parents’ doubts

B.lack of tuition

C.physical disability

D.terrible mood小题4:The best title for the passage might be _____.

A.A long way to go

B.Determined to learn

C.The only disabled student

D.I did not like that

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《刑法修正案(六)》第一百九十一条规定,以下行为是洗钱罪的具体行为。()

A、协助将资金汇往境外的

B、提供资金账户的

C、提供藏匿场所或运输服务的

D、提供虚假票证的

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下列说法正确的是(   )
A.物体做匀速运动,它的机械能一定守恒
B.物体所受合力不等于零,机械能可能守恒
C.只要有重力做功机械能就守恒
D.外力对物体做功的代数和等于机械能增量
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用硅橡胶类印模材料取二次印模,下面说法错误的是()

A.高黏度硅橡胶放在托盘上,低黏度硅橡胶注射在需精确印模的牙体周围,托盘口内就位取终印模

B.用高黏度硅橡胶取初印模,再用小头注射器将低黏度硅橡胶注射在需精确印模的牙体周围取终印模

C.需要修整初印模

D.精确度高,龈下边缘取模精确

E.缺点是费时

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跨国人力资源在处理文化多元化的战略类型主要有()

A.全球化策略

B.多元中心策略

C.规避策略

D.创新策略

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