单项选择题
Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent ().
A.excessive crankcase pressure B.excessive lube oil temperature C.contamination of the lube oil by water D.contamination of the cooling water by lube oil
单项选择题 The water in an auxiliary boiler should be tested daily for ().
单项选择题 A feed pump for an auxiliary boiler might lose suction if the ().
单项选择题 Fuel is admitted to a diesel engine cylinder through the ().