A.偏角 B.里程 C.圓曲線半徑 D.緩和曲線長(zhǎng)
A.1/2000 B.1/1000 C.1/5000 D.1/3000
A.切線長(zhǎng) B.曲線長(zhǎng) C.外矢矩 D.切曲差