问题
单项选择题
液压式双管路制动系的总泵都是把两个液压缸()安置于在一个缸体内。
A、并联
B、串联
C、分开
D、单独
答案
参考答案:B
液压式双管路制动系的总泵都是把两个液压缸()安置于在一个缸体内。
A、并联
B、串联
C、分开
D、单独
参考答案:B
Writing. |
Suppose you are Sonia. Complete the following letter. Introduce what your friends are doing according to the pictures. (假设你是Sonia,根据下列4张照片和所给的单词完成一封信,介绍你的朋友们都在干什么。) First: Tom and Mary, sing Second: Mike, run, like Third: John, play soccer ourth: Lisa, Amy and Eric swim, enjoy Dear Bob, Here are some of my photos. _______________________________________________________________________________________________________________________________________________________________________________________________________________________ |