Crohn病主要侵袭肠壁的
A．黏膜层B．全层C．肌层D．浆膜层E．黏膜下层
参考答案：B
Julia is very clever．In fact，I doubt whether anyone in the class has_______ IQ．
A．a high
B．a higher
C．the higher
D．the highest
磨机减速机起动前操作要求是什么？
