液力偶合器的分类？
参考答案：普通型、限矩型和调速型三大类。
Who would you like to have __________the letter?
A．to post
B．post
C．posted
D．posting
支架排列呈一直线、其偏差不超过（）mm
A.±50
B.±60
C.±70
D.±80
