单项选择题
Top piston rings are plasma coatedIt gives added safety for the of new lines（）
A.running-in
B.running-out
C.running on
D.running down
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相关考题
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单项选择题
For auxiliary engines the permissible overload is （） for one hour every twelve hours.
A.10%
B.15%
C.20%
D.25% -
单项选择题
The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）
A.dozens
B.parcels
C.bundles
D.gallons -
单项选择题
The piston crown employs the usual jet-shaker principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution（）
A.water cooling
B.oil cooling
C.air cooling
D.combined cooling
