A.陀螺羅經(jīng)航向 B.操舵磁羅經(jīng)航向和陀螺羅經(jīng)航向 C.操舵磁羅經(jīng)航向 D.船舶當(dāng)時(shí)的位置
A.30min B.15min C.20min D.10min
A.日沒(méi)時(shí)開(kāi)啟錨燈、甲板照明燈 B.日沒(méi)時(shí)落下錨球、降國(guó)旗 C.日出時(shí)升國(guó)旗,關(guān)閉錨燈及甲板照明燈,掛上錨球 D.A+B+C