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單項選擇題

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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單項選擇題

To avoid scavenge fires （） the engine timing and equipment maintenance should be correctly carried out.

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

單項選擇題

Those generally used additives for cooling water are either anti-corrosion oils or inorganic（）.

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