关于车用燃料添加剂方面的，麻烦各位帮忙翻译下面这几句 ...？ 说说和楼上理解不一样的地方： octane requirements were determined at the start of the experiment（试验一开始就进行辛烷值测定，此后每天一次） and once each day thereafter. the method consisted of introducing known octane number primary reference fuels into the carburetor at an air/fuel ratio of 13:1, and advancing the spark to produce trace audible knock（爆震） at wide open throttle. three reference fuels were used having octane numbers such that the spark advance of 60 bidc could be bracketed（涵盖60bidc，即曲线的范围要延至60bidc以上）. the octane requirement at 6 btdc was then determined by interpolation from a curve relating octane requirement to spark advance. 这个carburetor 和spark advance不知道专业词汇是什么，请高人指点。查看更多
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