“jack timber”的概念、定义、翻译、参考文献-科学参考

单词	jack timber
释义	jack timber [`jak ´tim·bǝr] ^{MINING ENGINEERING} A timber such as a rafter that is shorter than others with which it is used.
随便看	frequency-shift modulation frequency-shift transmission frequency-slope modulation frequency spectrum frequency splitting frequency stability frequency stabilization frequency standard frequency study frequency swing frequency synthesizer frequency table frequency telemetering frequency theory frequency-time-intensity frequency tolerance frequency-to-voltage converter frequency transformation frequency translation frequency translator frequency-type telemeter frequency variation fresco fresh fresh breeze

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