问题描述：
[单选]
The term “proper metering”， as applied to a diesel fuel injection system， can be best defined as（）．
A．delivering the same quantity of fuel to each cylinder for each power stroke according to engine load
B．maintaining the metering adjustment for a reasonable period under all load conditions
C．timing fuel injection to obtain maximum power and good fuel economy
D．distributing the fuel to all parts of the combustion chamber for proper combustio
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