行车道板的定义是什么?其作用是什么?

题型:问答题 简答题

问题:

行车道板的定义是什么?其作用是什么?

考点:土木建筑工程桥梁工程桥梁工程题库
题型:问答题 简答题

阅读短文,选择正确答案。

      My name is Jack. I'm 10 years old. I study in Willow School. My favourite day is Monday. We have P. E.

and computer class and we have potatoes for lunch. Potatoes are my favourite food. My favourite teacher is

Mr. Li. He's our art teacher. He is tall and strong. He's very active.

1. How old is Jack? 

A. He's 9 years old.

B. He's 10 years old.

C. He's fine.

2. What day is Jack's favourite day?

A. Monday.

B. Saturday.

C. Sunday.

3. What classes does Jack have on Mondays?

A. P. E. and science.

B. Computer and music.

C. P. E. and computer.

4. What's his favourite food? 

A. Cabbage.

B. Potatoes.

C. Tomatoes.

5. Who is Jack's favourite teacher?

A. Mr. Li.

B. Miss Li.

C. Willow School.

6. What's his favourite teacher like?

A. Young and pretty.

B. Old and kind.

C. Tall and strong.

题型:问答题 简答题

急性排斥反应中主要的效应因素是()

A.B细胞

B.TC细胞

C.补体

D.中性粒细胞

E.CD4+T细胞

题型:问答题 简答题

一种商品降价20%后,再提价25%就能恢复原价.______.

题型:问答题 简答题

已知R1<R2,如图所示的四种不同接法中,其总电阻最小的是[ ]

A.

B.

C.

D.

题型:问答题 简答题

一台三相交流异步电机,其定子槽数为24,极对数为2,则其电角度应该是()

A.15°

B.30°

C.40°

D.50°

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