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(3.143.214.100)
- 热门题目: 1.在有充分氧气存在时，烟垢的可 2.（）的废气锅炉烟垢着火现象（ 3.超级汽轮发电系统（STG）是