正确答案: D

the piston bosse

题目：Generally the gudgeon pin is fully floating in both connecting rod small end and （）.

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学习资料的答案和解析：

[单选题]（） fuel oils （） lubricating oils require treatment before passing to the engine.

Both；and

[单选题]The sealing rings are in four parts and pressed together around the piston rods by means of （）.

coil springs