“ballastless”的概念、定义、翻译、参考文献-科学参考

单词	ballastless
释义	ballastless Encyclopedia 工学道床结构释 ballastless有砟道床通常由具有一定粒径、级配和强度的硬质碎石堆集而成，碎石之间存在着空隙和摩擦力，使得轨道具有一定弹性的道床。
随便看	seed longevity seed magnetization processor seed manure seed-mediated transgene flow seed moisture content of herbage species seed multiplication of crop seed nucleus seed of life seed orchard seed pelleter seed plant seed polisher seed pregermination seed processing machinery seed production seed production area seed production of rapeseed seed production of rapeseed conventional cultivar seed production stand seed rearing seed rearing of Black grunt ，seed rearing of Hapalogenys nitens seed rearing of Boleophthalmus pectinirostris seed rearing of Chanos chanos seed rearing of Chelon haematocheilus seed rearing of Chromileptes altivelis

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