保留在船上的样品需要根据()进行保存。

【名词&注释】

相似性(similarity)、相容性(compatibility)、离心泵(centrifugal pump)、曲轴箱(crankcase)、轴功率(shaft power)、分离器、真空度降低(loss of machine of vacuum)、氟利昂(freon)、吸入真空度(vacuum for suction)

[单选题]保留在船上的样品需要根据()进行保存。

A. 相似性
B. 相容性
C. 毒性

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学习资料：

[单选题]When the fuel oil is burning in the combustion chamber, it _____.

A. gives up large amount of heat
B. gives off large amount of heat
C. gives up large amount of steam
D. gives off large amount of steam

[单选题]氟利昂^(freon)开启式活塞制冷压缩机的滑油分离器分出的滑油通常是( )。

A. 放至油污柜
B. 排回到吸气管
C. 直接排回到曲轴箱
D. 经吸气腔回油孔回到曲轴箱

[单选题]离心泵原先在额定工况工作，开大排出阀后( )。

A. 工作扬程增大
B. 轴功率减小
C. 效率增加
D. 允许吸入真空度^{(vacuum for suction)}降低^{(loss of machine of vacuum)}

[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.

A. Alternatively, if excessive oil has entered the air start system, a mixture of air and oil droplets may be discharged through the open cylinder non-return valve during starting. This spray may ignite due to high temperatures in the cylinder, causing a flame through the still open valve to the air manifold.
B. To prevent an explosion, air start valves must be correctly maintained and lubricated to ensure correct timing and free movement with positive closing. Oil in the system must be kept to a minimum, pipe lines must be drained and cleaned internally when necessary and oil discharge from air compressors must be kept to a minimum by good maintenance.
C. The passage is mainly about
D. crankcase explosion
E. scavenge box fire
F. starting air pipe
G. the danger of explosion in the starting air system

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