工频耐压试验时,接上试品后接通电源,开始进行升压试验时升压必须从()开始。 A.零(

题型:单项选择题

问题:

工频耐压试验时,接上试品后接通电源,开始进行升压试验时升压必须从()开始。

A.零(或接近于零)

B.50%试验电压

C.75%试验电压

D.100%试验电压

考点:电气试验工考试电气试验工(综合练习)电气试验工(综合练习)题库
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下列选项中哪一组的规律与其它三组的规律不同?[ ]

A.4   8    12   16   20

B.6   12   18   24   30

C.8   16   24   32   40

D.9   10   12   15   19

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“An old village woman in her seventies from Zhenjiang Province rented a small house in Shanghai and let visitors to the World Expo live there for free while she slept on a little couch. Her kindness moved(感动) countless people.” Chinese Premier Wen Jiabao said so at the Expo 2010 Shanghai China on October 31 when it ended.

It is a true story. The heroine of it is Ying Miaofang, an old woman from a village of Zhuji City in Shaoxing of Zhejiang Province. “I rented a house in Shanghai and received more than 330 Expo visitors during three months’ time. My house was never empty during that period.” Ying told reporters. She also said it was worth helping so many people to visit the Shanghai World Expo and she was praised by Premier Wen.

In the late of last May. Ying Miaofang paid 1,800yuan per month to rent a small house near Changning Road in Shanghai, and spent more money on a new air conditioner, a refrigerator, a TV set and other things. She published her phone number in the newspaper and opened the house for Expo visitors for free on June 23.

Besides providing a free living place., Ying got up very early every morning to buy food, cook breakfast, clean rooms and wash clothes for those guests. Many of her guests wanted to pay some money to her when they left, but she refused. In order to support the Shanghai Would Expo, Ying spent about 20 thousand yuan in all, which could not be regarded as a little money for a woman from a village.

小题1:The underlined work “countless” has the same meaning as _____

A.enough

B.many

C.few

D.countable小题2:The house cost Ying Miaofang _______ yuan during three months.

A.330

B.1,800

C.5,400

D.20,000小题3:Ying Miaofang is a(n)______________.

A.villager

B.worker

C.officer

D.volunteer小题4:The visitors living in the house which Ying Miaofang rented in Shanghai___________.

A.washed clothes for her

B.helped clean the rooms

C.cooked themselves

D.didn’t need to pay for it小题5:Ying Miaofang was very happy to ____________.

A.have a good time with her friends

B.help the visitors during the World Expo

C.make money for her family

D.have a good harvest in autum

题型:单项选择题

下列水果种植在北方地区的是[ ]

A.柑橘荔枝

B.苹果梨

C.芒果、香蕉

D.青稞、豌豆

题型:单项选择题

Na原子的1s电子能量比H原子的1s电子能量()

A.高

B.低

C.相等

D.符号相反

E.无法比较

题型:单项选择题

代谢使药物的代谢物具有药理活性或活性增强的是()

A.氯丙嗪

B.硝酸异山梨酯

C.磺胺

D.雌二醇

E.睾丸素

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