There are not many cars on the road____ ____the bad weather.
种树者必培其根,
种德者必养其心。
一只瓶子装满水时,水的质量为0.5千克,装满另一种液体时,液体的质量为0.4千克。求:①水的体积V水。②液体的密度ρ液。