“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	kinetics kinetic stress kinetic theory kinetid kinetin kinetochore kinetoplast Kinetoplastida kinetosome kinetotherapy king closer kingdom Kingdon trap kingfisher kingpin king post king post truss king's blue kingston valve kinic acid kinin kink kink band kink instability kinocilium

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