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單項(xiàng)選擇題

In order to ensure the safety of the ship and its equipment during UMS operation, certain essential functions （）.

A.must be provided
B.may be provided
C.have provided
D.can be provided

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單項(xiàng)選擇題

In order to ensure perfect atomization, the fuel oil （） before injection.

A.has to be cooled
B.has heated
C.has preheated
D.has to be preheated

單項(xiàng)選擇題

In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.

A.inefficiency
B.oiliness
C.detergency
D.purity

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