问题：
[单选] Those generally used additives for cooling water are either anti-corrosion oils or inorganic（）.
gases。paints。inhibitors。detergent。
问题：
[单选] To avoid scavenge fires （） the engine timing and equipment maintenance should be correctly carried out.
occurred。occurring。not happening。occur。
问题：
[单选] To avoid scavenge fires occurring the engine timing and equipment maintenance （）.
should be correctly carried out。should correctly be taken place。should carded with care。must to carry out with great care。
问题：
[单选] To counteract these undesirable effects cylinder oils usually contain additives formulated to impart a high degree of （） and detergency.
salinity。alkalinity。acid。sanitary。
问题：
[单选] To prevent the build up of high stresses engine must not be run continuously （）.
faster than dead slow speed。slower than dead slow speed。with the output of MCR。at critical speed。
问题：
[单选] Turbocharging of marine diesel engine is achieved by two distinct methods, （） termed the constant pressure and the pulse system.
respectable。respectful。respective。respectively。
问题：
[单选] Turbocharging system may be designed to operate on either the （） or the constant pressure exhaust system.
pulse。exhaust。fluctuating。hunting。
问题：
[单选] Under manoeuvring condition the main engine may run on （）.
gas oil。marine diesel oil。residue oil。crude oil。
variable injection timing。variable inlet tonnage。vertical incoming tonnage。vertical inlet tank。
问题：
[单选] Valve gear knocks are more easily located while the engine （）.
is running。stops。is repaired。lacks of oil。
