A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.<br>A:can’t be controlled very precisely<br>B:can’t be controlled as flexibly as the separate pump system<br>C:can be controlled as flexibly as the separate pump system<br>D:can be controlled more precisely and flexibly

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

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