What is an advantage of using foam in fire fighting?（）

A.It is effective in controlling fire in flowing oil such as coming from a broken fuel line

B.It absorbs heat from materials that could cause reignition

C.Most foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishment

D.Once the surface is blanketed with foam and the fire is extinguished，no further foam is required

有关结核病因和发病机制，以下叙述哪项是错误的（）

A．结核菌属于分枝杆菌

B．人型及牛型结核菌均可对人类致病

C．呼吸道为主要传播途径，少数经消化道传染

D．结核感染后产生Ⅱ型变态反应

E．结核病的免疫为细胞免疫