A:when; which
B:which; when
C:what; that
D:on which; when
被称为“地球之肺”的是:
实验目的:测生鸡蛋密度;
欲使0.1mol/L的NaHCO3溶液中c(H+)、c(CO32﹣)、c(HCO3¯)都减少,其方法是( )