单项选择题
To prevent the build up of high stresses engine must not be run continuously （）.
A.faster than dead slow speed
B.slower than dead slow speed
C.with the output of MCR
D.at critical speeds
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To counteract these undesirable effects cylinder oils usually contain additives formulated to impart a high degree of （） and detergency.
A.salinity
B.alkalinity
C.acid
D.sanitary -
单项选择题
To avoid scavenge fires occurring the engine timing and equipment maintenance （）.
A.should be correctly carried out
B.should correctly be taken place
C.should carded with care
D.must to carry out with great care -
单项选择题
To avoid scavenge fires （） the engine timing and equipment maintenance should be correctly carried out.
A.occurred
B.occurring
C.not happening
D.occur
