Fuel is delivered into the combustion space by （）.
- Aa cooling system
- Ba lubricating system
- Can electric system
- Dan injection system
问题
Fuel is delivered into the combustion
参考解析：
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1、（） into the cylinder because no fuel c
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2、The primary function of a fuel deliver
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3、The amount of fuel delivered by a unit
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5、The air required for combustion is tak
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6、When fuel is injected late into a dies
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