单项选择题

The ability of lubricating oils to resist viscosity changes during temperature changes is indicated by the（）

A.American Petroleum
B.Institute number viscosity index number
C.Seconds Saybolt Furol number
D.Seconds Saybolt Universal number

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The in the steering gear move the rudder to the required angel（）

A.control equipment
B.power unit
C.transmission mechanisms
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Positive displacement, helical gear pumps are well suited for pumping oil because （）

A.stuffing boxes eliminate the leakage problems usually associated with other gear pumps
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