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[单选题]

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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