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

The cylinder oil will have to neutralize the acidic pro...

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

As for turbine oil, contact with water in the form of s...

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

Any carbon built up on surfaces must be washed away by ...

单项选择题Any carbon built up on surfaces must be washed away by （） additives and held in suspension by a （） additive.