[填空题]
A house has a volume 2h2 t) *uh/kzkjudtw) : gpzp-wg0au*r,ew) -w-zjllf ,dsem-*vy4p of 770m$^2$ (a) What is the total mass of air inside the house at 20$^{\circ} $C? kg
(b) If the temperature drops to -10$^{\circ} $C what mass of air enters or leaves the house? kg