什麼液體比水更重

you mean physically heavier, or higher density?
if you mean physically heavier
any solution which formed by dissolving soluble salt and contain equal amount of water as that "water" is heavier than that "water"
e.g. sodium chloride solution, copper(II) sulphate solution
if you mean higher density
e.g. saturated sodium chloride solution, hydrochloric acid

三氯乙烯比水重

salt water
sugar solution ...............etc

飽和的糖水/糖漿

汗..........