“bad top”的概念、定义、翻译、参考文献-科学参考

单词	bad top
释义	bad top [`bad ´täp] ^{MINING ENGINEERING} A weak roof in a coal mine; sometimes develops following a blast.
随便看	amphoterite amp-hr amplexicaul amplexus ampliate amplidyne amplification amplification factor amplification noise amplified back bias amplifier amplifier-type meter amplify amplifying delay line amplitron amplitude amplitude discriminator amplitude distortion amplitude factor amplitude fading amplitude-frequency distortion amplitude-frequency response amplitude gate amplitude level amplitude limiter

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