| 单词 | octane ratings |
| 释义 | octane /okˈtān/nounAny of a group of eighteen isomeric hydrocarbons (C8H18), eighth in the alkane series ORIGIN: Gr oktō eight, and sfx -ane, as in methane octane number or octane rating noun The percentage by volume of so-called iso-octane (see under iso-) in a mixture with normal heptane which has the same knocking characteristics as the motor fuel under test |
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