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單項(xiàng)選擇題

In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.

A.aluminum-plated
B.bronze-plated
C.zinc-plated
D.chromium-plated

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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

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

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