“free fall”的概念、定义、翻译、参考文献-科学参考

单词	free fall
释义	free fall [`frē ´fȯl] ^MECHANICS The ideal falling motion of a body acted upon only by the pull of the earth's gravitational field. ^{PETROLEUM ENGINEERING} In deep drilling, an arrangement by which the bit is permitted to fall freely to the bottom at each drop or down stroke.
随便看	Istiophoridae Isuridae itabirite itacolumite itaconic acid itatartaric acid IT calorie itch item item advance item design item size iterated integral iteration iteration process energy state energy transfer energy-variant sequential detection energy winds enfilade enfleurage engaged column Engel-Recklinghausen disease engine engine balance

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