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问题 单项选择题

车制动系至少包括两套各自独立的制动装置，其中（）主要用于停车后防止车滑溜。

A.行车制动装置

B.驻车制动装置

C.气压制动传动装置

D.液压制动传动装置

答案

参考答案：B

听力题

根据汉语提示，完成下列单词的拼写，使句意通顺。

小题1:When you cross the road, you must pay attention to your s_____（安全）.

小题2:There’s no d      that computers are widely used by workers.

小题3:Going to Australia for further education for two month is a very e________(高兴的) and exciting experience for me.

小题4:A car e______ will be held in April in Shanghai. You can see many different kinds of cars.

小题5:No matter where the pop star goes, the fans will f______ him.
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多项选择题

GB/T1792测定硫醇硫时，若（）共存，与只有硫醇存在相比初始电位应更负。

A.硫醇

B.元素硫

C.硫化氢

D.硫醚
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