圆曲线起点 circular curve: 环路; 圆曲线;单曲线;圆弧曲线spring curve: 弹簧曲线; 弹力曲线spring of curve: 曲线起点circular curve data: 圆曲线要素circular curve location: 圆曲线测设下载手机词典可随时随地查词查翻译