在标准状况下,2.24L某气体的质量是3.2g,计算该气体的相对分子质量.
如图,在平面直角坐标系中,抛物线y=ax2+6x+c(a≠0)交y轴于A点,交x轴于B、C两点(点B在点C的左侧),已知A点坐标为(0,﹣5),点B的坐标为(1,0).
Tell your friend that you ____ ____ ____ her and you'll talk with her after class.