接地保护用零序分量原理构成,所谓零序分量就是()。 A.各相电流相等按顺时针顺序排列

题型:单项选择题

问题:

接地保护用零序分量原理构成,所谓零序分量就是()。

A.各相电流相等按顺时针顺序排列

B.各相电流相等按反时针顺序排列

C.各相电流大小相等方向相同

考点:集控值班员考试电气运行电气运行题库
题型:单项选择题

Mrs. Beet, a 38-year-old woman, lived in a house near a river. Every day she drives very fast to work.

On her way back from work yesterday afternoon, she was driving faster than usual because she was worried about her little son. He was alone at home. While she was trying to pass a truck before her, she saw another car coming. She quickly turned her steeling wheel(方向盘). Her car didn’t hit the other car, but she could not stop her own car. It ran into the river.

Luckily, Mr. Jackson, a very good swimmer, saw what was happening. He jumped into the water at once. He swam over to the car. He got to Mrs. Beet through an open window. He pulled her out of the window and then out of the water. Back on land, he gave Mrs. Meet mouth-to-mouth breathing. Soon the lady came to herself.

根据短文内容,判断句子的正误,正确的在答题卡上涂T,错误的涂F。(每小题1分,共5分)

小题1:Every day, Mrs. Beet drives her car to work.

小题2:Yesterday afternoon Mrs. Beet walked home quickly because she worried about her little son.

小题3:Her car didn’t hit the other car but ran into the river.

小题4: Luckily, Mr. Jackson was good at swimming.

小题5:In the end, Mr. Jackson pulled Mrs. Beet out of the water and saved her.

题型:单项选择题

把下面的词语按一定的顺序排列起来。

1.开花   发芽   结果   长叶

                                                                                                            

2.播种   浇水   买种   翻地

                                                                                                            

3.地球   银河系   亚洲   太阳系

                                                                                                             

4.凉爽   酷热   寒冷   炎热

                                                                                                             

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洋葱和小狗是真核生物,大肠杆菌是原核生物,它们都具有的结构是(  )

A.细胞壁

B.细胞膜

C.细胞核

D.叶绿体

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