When are windows the weak link in a building?A．In the cold winter.B．In the hot summer.C．When air conditioners are turned on.D．Both Ａ and Ｂ.
题目
When are windows the weak link in a building?
A．In the cold winter.
B．In the hot summer.
C．When air conditioners are turned on.
D．Both Ａ and Ｂ.