气胸的典型X线表现哪项不正确()
A.患侧胸腔透亮度增加
B.肺压缩征
C.可见气胸带
D.少量气胸不易发现时嘱患者深吸气,从而易于显示气胸带
E.血气胸时可见液气平面
参考答案:D
If I ________ you, I'd take the small apple.[ ]
A. am
B. were
C. was
什么叫化学物的联合作用?主要有哪几种类型?