问题 单项选择题

下列不能作为防爆转接箱的材质的是()。

A、玻璃纤维不饱和树脂

B、不锈钢

C、塑料

D、铸铝合金外壳

答案

参考答案:C

辨音题

将下列单词结合所给音标归类。

name    quite    but    wall    map    piece    rock    ruler    excuse    notebook    great    cool    woman    rainy

ball    over    sorry    miss    banana    meat    beautiful    bus    fly    apple

1、[i:]                                                    

2、[Q]                                                     

3、[u:]                                                   

4、[A]                                                 

5、[R]                                                 

6、[ei]                                                 

7、[i]                                                   

8、[ju:]                                               

9、[[]                                                  

10、[R:]                                                 

11、[[U]                                                

12、[ai]                                                 

单项选择题