单项选择题
A.low pressure at all times B.full pressure at all times C.low pressure at intermittence D.full pressure at intermittence
Starting air for auxiliary engines may be taken directl...
单项选择题Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.
A.an auxiliary reservoir B.a controlling air bottle C.an emergency air compressor D.a main air compressor
Two main lubricating oil pumps are usual and are obliga...
单项选择题Two main lubricating oil pumps are usual and are obligatory in （）.
A.container ships B.bulk carriers C.passenger ships D.barges
In motor-ships, （）, after passing through main and moti...
单项选择题In motor-ships, （）, after passing through main and motion bearings and oil cooled pistons, etcis either retained in the bedplate.
A.the fuel oil B.the lubricating oil C.the refrigerating oil D.the hydraulic oil
