破伤风的前驱症状是
A．乏力、头晕、头痛
B．陈发性痉挛
C．反射亢进
D．咀嚼无力
E．局部肌肉发紧
参考答案：A,C,D,E
六滚筒开棉机开松除杂作用是怎么实现的？影响其开松的因素？
The neogrammarians, represented by ______, formed the main linguistic basis of the Direct Method.
A. W.M.Wundt B. J.A.ComeniusC. F.Gouin D. Hermann Paul
