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

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.

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.