问题描述：
[单选]
Before starting any diesel or gasoline engine，which of the following must be checked？
A．Oil level
B．Flow of cooling water
C．Exhaust discharge
D．All of the above
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：Diesel engines are considered safer than gasoline engines because（）．
下一篇：All marine low-speed diesels are of what design？
- 我要回答: 网友(216.73.216.168)
- 热门题目: 1.发电柴油机吊缸检修时，如发现 2.吊缸检查气缸盖的气阀时，主要 3.吊缸检修时，对气缸盖应着重检