正确答案: B

保证两者中心线重合或平行

题目：保证柴油机运动部件与固定件的准确相对位置，实质上是要（）。

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学习资料的答案和解析：

[单选题]常用的船舶防污染设备有（）。

A+B+C

[单选题]废气涡轮增压器壳体腐蚀的原因主要有（）等造成。Ⅰ.硫酸腐蚀；Ⅱ.穴蚀；Ⅲ.高速气流引发的腐蚀；Ⅳ.冷却水腔的海水腐蚀；Ⅴ.喷水腐蚀。

Ⅰ＋Ⅲ＋Ⅴ

[单选题]滑油系统预热的方式有（）。Ⅰ.蒸汽加热；Ⅱ.电加热；Ⅲ.分油机分油加热；.Ⅳ.热水加热

Ⅰ+Ⅲ

[单选题]As a heat engine,（） energy is the source of power by which the diesel engine can be operated.

heat

[单选题]In order to ensure the safety of the ship and its equipment during UMS operation, certain essential functions （）.

must be provided

[单选题]The gas loads on the engine structure are constrained by means of hydraulically preloaded （） which connect the bed plate, frame sections and cylinder jackets into a single unit.

tie rod

[单选题]There should be a lubricating oil （） between the main beatings and the crankshaft.

film

[单选题]Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?（）

Pressure lubrication