“helper grade”的概念、定义、翻译、参考文献-科学参考

单词	helper grade
释义	helper grade [`hel·pǝr ´grād] ^{MINING ENGINEERING} A grade on which helper engines are required to assist road locomotives. Also known as pusher grade.
随便看	booster battery booster brake booster ejector booster engine booster fan booster pump booster response booster rocket booster stations booster voltage Hofmann reaction Hofmann rearrangement Hofmeister series hog hogback hog cholera hog frame hogged fuel hogging hog gum hoghorn antenna hohlraum hohmannite Hohmann orbit Hohmann trajectory

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