【名词&注释】
安全阀(safety valve)、救生艇(boat)、低位肠梗阻(distal ileus)、偏心轮机构(eccentric mechanism)
[判断题]糖尿病病人易生疖痈等感染,病人感染后伤口不易愈合。
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举一反三：
[单选题]大管轮负责对＿进行定期检查试验。①起重设备；②安全阀；③机舱灭火设备；④应急舱底阀；⑤机舱水密门；⑤燃油速闭阀。
A. ①②③
B. ①②③④
C. ①②③④⑤
D. ①②③④⑤⑥
[单选题]下列表述正确的是( )。
A. 柴油机启动空气分配系统常采用凸轮机构
B. 回油阀式高压油泵常采用凸轮机构
C. 偏心轮机构(eccentric mechanism)常用于变向变量油泵
D. 凸轮与从动杆的接触为低副
[单选题]互见中，一帆船与一从事捕鱼的船舶交叉相遇致有构成碰撞危险，应________。
A. 帆船避让从事捕鱼的船舶
B. 适用交叉局面条款
C. 两船均应采取避让行动，因为该两船负有同等的避让责任和义务
D. 从事捕鱼的船应给帆船让路
[单选题]救生艇所配备的淡水可供满载人员使用：
A. 3天
B. 4天
C. 7天
D. 5天
[单选题]申请二管轮考试者，应持有相应航区、等级的三管轮适任证书，并担任其职务满__月。
A. 12
B. 15
C. 18
D. 24
[单选题]低位肠梗阻时，呕吐出现______。
A. 早而频繁
B. 早而不频繁
C. 晚而频繁
D. 晚而不频繁
[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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