HS____ Ag2Cl____ NaCO3____MgNO3____
AlSO4____MgOH____ BaO2____NH4SO4____.
下列海峡和运河中,地处亚非两洲之间的是
Sandy isn't beautiful, but she is very cute.
某抛物线的顶点坐标为(1,﹣2),且经过(2,1),则抛物线的解析式为( )
下图为人口相等的四城市某年人口变动资料,据图回答下列小题。