咳嗽伴咯血（）

A.呼吸道感染

B.胸膜炎

C.喉部疾病

D.肺结核

E.支气管哮喘

When fighting a fire in an enclosed space，the hose team should crouch as low as possible to（）.

A.protect themselves from smoke

B.obtain the best available air

C.allow the heat and steam to pass overhead

D.All of the above