划分南北半球的界线是( )
A.0°经线
B.赤道
C.160°E
D.回归线
是赤道将地球平均分为了南北半球,作为了划分南北半球的界线.
故选:B.
It is believed that if an event is _______, it will surely ______ the readers of the paper.
A.astonished; astonish
B.astonishing; be astonished
C.astonishing; astonish
D.astonished; be astonished
下列化学用语书写正确的是( )
A.NH3分子的结构式:
B.CO2分子模型的示意图:
C.乙烯分子的结构简式:CH2CH2
D.Na2O的电子式: