A.45 B.46 C.47 D.48
A.經度1′ B.緯度1′ C.經度1″ D.緯度1″
A.31°29′48″N/121°30′30″E B.31°29′8″N/121°30′5″E C.31°29′20″N/121°30′43″E D.31°29′80″N/121°30′50″E