检修规程规定:段修时,客车制动梁端轴磨耗超过()mm时,应进行焊修。
参考答案:3
_____ hungry Iam,I never seem to be able to finish off this load of bread. [ ]
A.Whatever
B.Whenever
C.Wherever
D. However
润滑油添加剂的作用是什么,常用的添加剂有哪些?