密度（density）

1、If oil density were greater than water

If oil density were greater than water’s, the oil separator （）.Adid workBwould work wellCdidnt workDwouldnt work

2、low-density lipoprotein, LDL (低密度的脂蛋白)

low-density lipoprotein, LDL (低密度的脂蛋白)

3、功率线密度 linear power density

功率线密度 linear power density

4、交通密度（Density）

交通密度（Density）

5、关键字密度（Keyword Density）

关键字密度（Keyword Density）

6、功率密度 power density

功率密度 power density