單項(xiàng)選擇題

The main purpose of changing main engine to electronic controlled is not to（）

A.control fuel injection time more precisely
B.control fuel injection rate more precisely
C.meet the environmental requirements
D.meet high engine speed requirements

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單項(xiàng)選擇題

To meet the market requirements, a marine diesel engine should not be of（）

A.big size
B.fuel economy
C.low speed
D.high power

單項(xiàng)選擇題

The common rail engines show great advantages in combustion especially（）.

A.at high speed and full load
B.at low speed and part load
C.when heavy fuel oil is used at sea
D.when the ships run long distance