NS用作负荷开关时,如何选型?

题型:问答题 简答题

问题:

NS用作负荷开关时,如何选型?

考点:施耐德低压电气考试施耐德低压电气考试题库
题型:问答题 简答题

阅读理解.

     There's a special kind of dog. They're like the eyes of blind people. We call them 'seeing eye

dogs'.These dogs are trained for several months. Then, they lie with a blind person. Their job is

very important. They help blind person walk around a city.

     Seeing eyes dogs know how to cross the street. They wait for a green light. They can also

avoid danger, like cars, bicycles, and holes in the road.

     Sometimes you many see these dogs with their owners. Like most dogs, seeing eye dogs are

often cute. You should not pet them. Remember, they are working hard.

1. What is the main idea of the passage?

A. Seeing eye dogs are cute.

B. All blind people have seeing eye dogs.

C. Seeing eye dogs help blind people a lot.

D. Streets are full of danger.

2. "Seeing eye dogs"

A. are blind.

B. cannot cross the street.

C. are trained to do their job.

D. don't usually avoid danger.

3. Which city danger is not talked about?

A. Crimes

B. Bicycles.

C. Cars.

D. Holes in the road.

4. When will the dogs cross the street?

A. At any time.

B. When will the dogs cross the street?

C. They never cross the street.

D. When the light is green.

5. Which of these sentences is true?

A. All blind people have seeing eye dogs.

B. In the street, blind people have many dangers to avoid.

C. It's fine to pet seeing eye dogs.

D. There is no safe way to cross the street.

题型:问答题 简答题

豌豆灰种皮(G)对白种皮(g)为显性,黄子叶(Y)对绿子叶(y)为显性。每对性状的杂合体(F1)自交后代(F2)均表现3:1的性状分离比。以上种皮颜色的分离比和子叶颜色的分离比分别来自对以下哪代植株群体所结种子的统计?[ ]

A.F1植株和F1植株

B.F2植株和F2植株

C.F1植株和F2植株

D.F2植株和F1植株

题型:问答题 简答题

可摘局部义齿修复的主要目的是

A.统一性

B.功能性

C.稳固性

D.预防性

E.坚固性

题型:问答题 简答题

根毛细胞的细胞液浓度最大的植物,分布在()。

A.热带雨林

B.荒漠

C.草原

D.森林

题型:问答题 简答题

低含盐量的淡水Na+含量较低,但对高含盐量的苦咸水,尤其是海水,由于钠、钾盐溶解度大于其他盐类,所以Na+含量远远高于其他阳离子。()

更多题库