单词 | octane number |
释义 | octane number [`äk´tān ´nǝm·bǝr] ENGINEERING A rating that indicates the tendency to knock when a fuel is used in a standard internal combustion engine under standard conditions; n-heptane is 0, isooctane is 100; different test methods yield other values variously known as research octane, motor octane, and road octane. |
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