常年性变态反应性鼻炎常见的吸入性变应原有()
A．屋内尘土
B．螨
C．花粉
D．羽毛
E．细菌
参考答案：A, B, C, D
___ no need for us to discuss the problem again. It has already been settled.
A．It has
B．There has
C．It is
D．There is
夹板外固定应注意的事项中，下列哪一项是错误的（）
A.绑带的松
B.压垫的放置
C.患肢的血运
D.骨突部的衬垫
E.有利于持重活动
