We like playing table tennis school.
A:on
B:before
C:after
D:of
①AlCl3溶液和NaOH溶液
②Ca(HCO3)2溶液和NaOH
③NaAlO2溶液和NaHSO4溶液
④Al2(SO4)3和氨水
⑤AgNO3溶液和氨水.
某地往西是东半球,往东是西半球,往南是高纬地区,往北是中纬地区,该地为( )