你可能感興趣的試題

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

單項選擇題

A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.

A.can’t be controlled very precisely
B.can’t be controlled as flexibly as the separate pump system
C.can be controlled as flexibly as the separate pump system
D.can be controlled more precisely and flexibly