单项选择题
A.icing of the automatic controls B.embrittlement of some parts of the automatic controls C.sludge in the lubricating oil D.all of the above
Black smoke coming from a boiler can be caused by （）.A....
单项选择题Black smoke coming from a boiler can be caused by （）.
A.low water level B.high water level C.excessively high fuel pressure D.low oil temperature
If a bilge pump failed to build up discharge pressure, ...
单项选择题If a bilge pump failed to build up discharge pressure, you should check for （）.
A.excessive water in the bilges B.a clogged suction strainer C.oil in the bilges D.All of the above
The shaft and spare parts（） should be well greased in o...
单项选择题The shaft and spare parts（） should be well greased in order to avoid corrosion.
A.in the store room B.in the cylinder C.in the scavenge air box D.in the water box
