| 摘要 |
A small proportion, preferably 0.01--0.05 per cent of hard or other wood tar or a fraction thereof is added to cracked gasolene or other liquid hydrocarbon motor fuel to prevent gum formation and fall in anti-knock value. The 240--280 DEG C. and 240--300 DEG C. fractions of oak and hickory wood tars are exceptionally efficient.
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