单项选择题
A.increase its quality B.obtain complete burning C.reduce its weight D.all of the above
In a complete oil/water separator, more oil will separa...
单项选择题In a complete oil/water separator, more oil will separate out onto the underside of these plates and travel outwards until it is free to rise into the oil collecting space Whats the meaning of "it" in the sentence above?（）
A.a separator B.oil C.water D.an oil collecting space
In a commonly used fuel oil system, the oil is stored i...
单项选择题In a commonly used fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.
A.a service tank B.a settling tank C.an expansion tank D.a double bottom tank
In a central cooling system, used in some modem ships, ...
单项选择题In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.
A.main bearings B.sea water C.cooling oil D.lower temperature fresh water
