豎曲線起點(diǎn) beginning of curve: 曲線起點(diǎn)beginning of curve bc: 曲線起點(diǎn)beginning of transition curve: 緩和曲線起點(diǎn)vertical curve: 豎曲線; 豎向曲; 豎直線; 縱斷面曲線concave vertical curve: 凹形豎曲線下載手機(jī)詞典可隨時隨地查詞查翻譯
