“sleeper”的概念、定义、翻译、参考文献-科学参考

单词	sleeper
释义	sleeper [`slēp·ǝr] ^{CIVIL ENGINEERING} A timber, steel, or precast concrete beam placed under rails to hold them at the correct gage.
随便看	speed speed circle speed cone speed control speed-course-latitude error speed density metering speed error speed-in speed lathe speed-length ratio speed line speed made good speed-matching buffer speed of advance speed of light speed of response speed of sound speed of travel speedometer speed over the ground speed-payload tradeoff speed-power product speed reducer speed regulator Russell flask

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