山西煤运到上海的最佳运输选择是( )
A:公路
B:铁路
C:铁路+长江航运
D:铁路+海运
_____ Li Bai, a great Chinese poet, was born is known to the public, but some won’t accept it.
一昼夜钟面上的时针和分针重叠( )次.