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为了保证船舶航行安全,首先要确定船舶的航向与位置。船舶定位方法按照参照目标可分为( )。

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.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.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.The passage is mainly about
船舶防火控制图集中反映了船舶消防、救生设备的安全技术性能,是保障船舶营运安全的重要性图纸。
保持安全值班的目的包括:Ⅰ、避免船舶发生碰撞事故Ⅱ、避免船舶发生火灾Ⅲ、避免船舶污染环境()
《中华人民共和国船舶安全检查规则》适用什么船舶?
为了保证船舶安全,船舶的适度稳性是()。
根据我国现行船舶最低安全配员规则,下列叙述正确的是:()I、船舶安全配员标准是船舶配备船员的最低要求;II、中外国籍船舶都应持有海事管理机构颁发的《船舶最低安全配员证书》;III、海事管理机构如认为配员减免后无法保证船舶安全时,可不予减免或者不予足额减免;IV、船舶在航行、停泊、作业时,必须将《船舶最低安全配员证书》妥善存放在船备查
下列哪些船舶应遵守我国现行船舶安全检查规则的要求?()Ⅰ、任何海船;Ⅱ、任何内河船舶;Ⅲ、从事营业性运输的中国籍渔业船舶

下列关于船舶安全检查的说法中,正确的是()。
Ⅰ、船舶接受安全检查时,陪同检查的船员引导检查人员即可
Ⅱ、船舶接受安全检查时,陪同检查的船员应按检查人员要求,调试、操纵有关设备
Ⅲ、中国籍船舶接受安全检查时出示船舶安全检查记录簿

When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the()
The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be ().
Before starting any diesel or gasoline engine,which of the following must be checked? ()
When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its()
Which of the following may cause that an engine doesnt run on starting air?()
Which of the following may cause that an engine doesnt turn on starting air?()
The loss of () from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.
Pump up the starting air reservoirs to their maximum pressure and ()the air reservoirs and air system.
() supplies pilot air to control the cylinder air start valves.
The primary task of the compressed air system is to deliver the starting air necessary for ()
If the electric motor driving an air compressor fails to start, the cause may be a ().
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