“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	standard interface standardization standardize standardized product standardized test statistic standardized units standard leak standard lens standard load standard loran standard measure standard meridian standard mineral standard model standard noise temperature standard noon standard output standard parallel standard performance standard pitch standard plane standard potential standard preemphasis standard pressure standard project flood

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