小明在探究甲、乙两种不同物质的质量和体积的关系时,得出了如图所示的图象.由图象可知,甲、乙两种物质的密度之比ρ甲:ρ乙= ____.用甲、乙两种不同的物质做成质量相同的实心体,则它们的体积之比V甲:V乙= ____
Mary, Jane and May are very good friends. Mary is shorter than May, May is heavier than Jane. Jane is thinner than Mary. How old are they? Mary is 7 years old. Jane is 12 years old and May is 9 years old. They study at Qinglan Primary School. Mary likes English, Jane likes math and May likes music. They all study hard.
①取少量固体于烧杯中,加足量的水溶解,烧杯内有固体残留并得到无色溶液甲;
②取少量无色溶液甲于试管中,滴加酚酞溶液,溶液不变色;
③继续向①的烧杯中滴加稀硝酸并不断搅拌,烧杯内固体的质量随加入稀硝酸质量的变化如图所示。
Diaoyu Islands __________ China ever since ancient times.