正确答案: A
2
题目:油润滑艉轴承的长度应不小于()倍的艉轴直径。
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学习资料的答案和解析:
[单选题]对商船动力装置的基本要求是()。
A+B+C
[单选题]If the engine does start on air, but combustion does not immediately begin, the cause may not be ().
turning gear being still o
[单选题]In the four-stroke engine, it takes () to make one power stroke.
two revolutions