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
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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 -
单项选择题
This used piston had been tested and approved as a spare part by the （） during last annual repair.
A.agent
B.shipchandler
C.surveyor
D.engineer
