发动机的（）称为综合润滑。
A.传动件润滑
B.润滑系统
C.配气机构润滑
D.缸壁润滑
参考答案：B
Eating Dangshen and Huangqi _________ good for people if they are weak and tired. [ ]
A. is
B. are
C. were
D. was
控制回路为什么要采取电气防跳措施？
