“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	radar confusion reflector radar conspicuous object ultralight aircraft ultramafic ultramarine blue ultramicrobalance ultramicroscope ultramicrotome ultraperformance composite ultraphotic rays ultrarelativistic ultrasensitive mass spectrometry ultrashort waves ultrasonic ultrasonic atomizer ultrasonic bonding ultrasonic camera ultrasonic cleaning ultrasonic coagulation ultrasonic communication ultrasonic delay line ultrasonic depth finder ultrasonic drill ultrasonic drilling ultrasonic echo

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