正确答案: C

保持艇首顶风顶浪

题目：海锚主要作用之一是（）

解析：C

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举一反三的答案和解析：

[单选题]第二组Under normal operation, some lubrication oil mist may be discharged from the air compressor to the air start system. This oil may be from excess compressor cylinder lubrication, from faulty oil scraper rings, or may even be suspended oil vapor contaminating the engine room atmosphere and drawn in at the compressor suction. Oil discharge is kept to a minimum by draining the after cooler, air receiver and starting system. If small quantities of lubrication oil do get passed into the starting air system, they will deposit as thin moist film over internal pipe surfaces but are not readily combustible. If a cylinder non-return valve leak while the engine is in operation, some hot gas, possibly with unburned fuel and cylinder lubrication oil, may be blown through the valve to the adjacent air manifold. With further heating from the leaky valve, this, together with the already deposited oil film, will carbonize and form. incandescent carbon. If starting air is applied to the system while still hot, the high pressure air coming into contact with the burning carbon may cause an explosion. Such an explosion will cause a flame to pass back through the air start pipe system, evaporating the deposited oil film and igniting it in the presence of air. Very high velocities and shockwaves are generated which may rupture pipes and fittings.

the danger of explosion in the starting air system

[单选题]A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with .

a high viscosity index

[单选题]实际使用中分油机重力环的选用一般是( )。

根据燃油的密度查图表得出

[单选题]During the dock repair,______should be measured firstly before tail shaft drawn out.

the sinking of tail shaft