问题描述：
[单选]
The marine diesel engine is a type of diesel engine used on ships The（）of its operation is not very difficult to understand．
A．principle
B．principal
C．cause
D．case
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：The mechanical efficiency of an engine（）because losses occur in the form of friction．
下一篇：The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the（）cycle．
- 我要回答: 网友(3.145.12.233)
- 热门题目: 1.低速柴油机的最低稳定转速不高 2.船舶由全速前进到开始倒航所滑 3.体现主机紧急倒车性能的指标是