正确答案: D

piston ring belt

题目：In some designs the cylinder oil is timed so that the oil injects only on the （）.

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学习资料的答案和解析：

[单选题]平均寿命E（t）是个箅术平均值，在概率中称（）。Ⅰ.数学期望值；Ⅱ.均值

Ⅰ，Ⅱ都对

[单选题]备车时间的长短，各类船舶有所不同，一般在（）h。

0.5—6

[单选题]On the top of the cylinder is mounted the cylinder cover which is pressed onto （） of the cylinder liner by means of nuts and studs.

the flange

[单选题]On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.

pressure feed