正确答案: C

density

题目：Here some oil in the oily water separator, as a result of its lower （）, will separate and rise into the oil collection space.

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学习资料的答案和解析：

[单选题]航行中对发电柴油机曲轴的断裂可以应急焊接修理，并进行封缸以维持柴油机运转。封缸的正确操作应该是（）。Ⅰ.停止燃烧；Ⅱ.降速运行；Ⅲ.吊出活塞连杆；Ⅳ.封死气缸启动阀；Ⅴ.关闭进排气阀。

Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ

[单选题]当气阀阀面烧穿出现边缘孔洞时应（）工艺修复。

换新

[单选题]中间轴承对轴系可靠性影响的主要因素是中间轴承的都不对（）。Ⅰ.位置；Ⅱ.数量；Ⅲ.间距

Ⅰ+Ⅱ+Ⅲ

[单选题]由于螺旋桨的（）失效会导致船舶剧烈振动。

某一桨叶折断

[单选题]Each cylinder has one starting valve which is usually opened by air pressure and closed by （）

spring force

[单选题]The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and （） of the pistons in the cylinders.

seizure

[单选题]The pumps employed on board ship can be divided into two main categories ie（） pumps and centrifugal pumps.

positive displacement

[单选题]Most fuel injection nozzles are opened by （）.

fuel oil pressure