正确答案: A

additives

题目：In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.

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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]柴油机吊缸时，不正确的做法是（）。

在拆卸下来的零件配合面上做好记号

[单选题]An aluminum piston has lower inertia and higher coefficient of （） compared to that of cast iron.

thermal expansio

[单选题]In an ordinary diesel engine the fuel injection begins （）

before TDC

[单选题]In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.

piston ring area

[单选题]The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）

bearing metal

[单选题]The piston supporting body is mainly subjected to （） stress.

compressive