问题 单项选择题

铸铁件电弧焊选择电流大小的主要依据是焊条的种类、()和待焊裂缝在工件上的位置以及焊缝接头类型等。

A、铸铁件的厚度

B、焊缝大小

C、直径的大小

D、电压的大小

答案

参考答案:C

阅读理解

根据下列图示及叙述,完成下列各题。

                        A                                B                             C

   

                     D                                    E

       

1. It lives in Australia.  It has very strong legs. It is grey ( 灰色). It can jump high. It is very good at looking

  after her baby. A mother has a pouch in front. There, the babies are warm and saf'e. It is a _____.

2.  It is from Africa.  It can run f'if'ty kilometers (公里) an hour. It has a very long neck and long legs. It

 can reach the leaves on a very tall tree. It is a _____.    

3. It lives on the Antarctic. It is always very cold there. It is black and white. It can walk on the ice and

  swim in the sea. It's a big bird, but it can't fly. It eats fish. It has very short legs. It looks very lovely.

 Children like it a lot. It is a _____.

4. It is also from Africa.  It is black and white, too.  It has a long tail.  It can run very fast. We can see it in

  zoos and pictures. It is a _____.    

5. It is very lovely. It is not from Africa. It is from China. It is white and black. It likes bamboos. There are

  not many of them in China now.  Everyone loves it very much. It is a _____.

1.  Fill in the blank (空白) of each paragraph.

    1._____   2._____    3._____     4._____   5. _____

2. The black and white animal from Africa has _____

    A. a long tail          

    B. a long neck

    C. a grey body        

    D. a pouch in front

3. _____ is good at swimming in the sea.

    A. A zebra    

    B. A panda

    C. A penguin    

    D. A giraffe

4. In this reading, the underlined word"pouch"means"_____" in Chinese.

    A. 口袋    

    B. 育儿袋

    C. 爪子    

    D. 婴儿

单项选择题