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單項(xiàng)選擇題

It is often necessary to put an engine into （） service with one or more cylinders cut out, or with a turbocharger secured.

A.additional
B.permanent
C.temporary
D.long

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單項(xiàng)選擇題

The cylinder oil will have to neutralize the acidic products of combustion and have good （） properties to keep the metal surfaces clean.

A.detergent
B.de-oiling
C.defrosting
D.demulsifying

單項(xiàng)選擇題

As for turbine oil, contact with water in the form of steam will be inevitable so good （） properties will be essential.

A.defrosting
B.de-oiling
C.demulsifying
D.dehumidifying

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