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题目：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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[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。

①②③④⑤⑥

[单选题]下列表述正确的是( )。

柴油机启动空气分配系统常采用凸轮机构

[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________。

帆船避让从事捕鱼的船舶

[单选题]救生艇所配备的淡水可供满载人员使用：

7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。

18

[单选题]低位肠梗阻时，呕吐出现______。

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.

the danger of explosion in the starting air system