To counteract these undesirable effects cylinder oils usually contain additives formulated to impart a high degree of （） and detergency.

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

A.occurred
B.occurring
C.not happening
D.occur

A.gases
B.paints
C.inhibitors
D.detergent