(驼峰调车区)坡度纵断面 constant gradient velocity profile: 等梯度速度剖面fracture gradient profile: 裂隙梯度剖面profile gradient component: 剖面梯度分量relative profile gradient: 起高渐变率zero-pressure gradient profile: 零压梯度分布图下载手机词典可随时随地查词查翻译