“compression ratio”的概念、定义、翻译、参考文献-科学参考

单词	compression ratio
释义	compression ratio [kǝm`presh·ǝn ´rā·shō] ^ELECTRONICS The ratio of the gain of a device at a low power level to the gain at some higher level, usually expressed in decibels. Also known as compression. ^{MECHANICAL ENGINEERING} The ratio in internal combustion engines between the volume displaced by the piston plus the clearance space, to the volume of the clearance space. Also known as compression. ^METALLURGY Ratio of the volume of loose metal powder to the volume of the compact made from it.
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