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單項(xiàng)選擇題

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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單項(xiàng)選擇題

For auxiliary engines the permissible overload is （） for one hour every twelve hours.

A.10%
B.15%
C.20%
D.25%

單項(xiàng)選擇題

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

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