正确答案: B

of trunk piston type

题目：Marine four-stroke diesel engines are mainly （）.

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学习资料的答案和解析：

[单选题]At least （） cylinders in four-stroke engine will be configured to ensure that the engine can be started with the crankshaft at whatever position.

6

[单选题]Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.

All of the above