问题描述：
[单选]
In a diesel engine lube oil system， which of the following parts should be lubricated first？
A．Camshaft beatings
B．Main bearings
C．Piston crowns
D．Cylinder wall
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：Fuel oil transfer systems used onboard diesel propelled vessels are required to have（）．
下一篇：Before starting a diesel engine that has an engine driven lube oil pump， the engineer should（）．
- 我要回答: 网友(216.73.216.84)
- 热门题目: 1.废气锅炉的高温着火有（）。Ⅰ 2.关于废气锅炉烟垢着火温度（） 3.动力装置长期在部分负荷下工作