"But the doctor can't use just anyone's blood. The donor's blood has to be of a type that won't be destroyed by your blood." This statement means that______.

A．the doctor can't use the donor's blood because your blood can destroy this

B．the doctor has to choose a donor whose blood can not be destroyed by your blood

C．the doctor has to choose a certain type of blood from a donor whose blood will not be destroyed by yours

D．the doctor can choose a certain type of blood from any donors

消防防排烟设备有很多，其中不包括（）设备。

A.防火门、防火卷帘

B.屋顶风机、轴流风机

C.防火阀、挡烟垂壁

D.排烟风机、加压风机