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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

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

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

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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

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