单项选择题
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
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相关考题
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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 -
单项选择题
Those generally used additives for cooling water are either anti-corrosion oils or inorganic（）.
A.gases
B.paints
C.inhibitors
D.detergent
