流化
参考答案：指炉床上的固体燃料颗粒在气流的作用下转变为类似流体状态的过程。
Catherine is one of the brightest students who from the Department of Computer Science , Brown University .
A．is graduated
B．has graduated
C．are graduated
D．have graduated
试述维生素D缺乏性手足搐搦症患儿如何防止窒息？
