抛射剂常用氟里昂在处方中约占
A．20%～25%B．25%～30%C．30%～40%D．20%～50%E．20%～65%
参考答案：E
The boy _______ blue is my brother.
[ ]
A. in
B. on
C. to
D. of
中央型肺癌胸部X线的直接征象为
A．肺不张B．阻塞性肺炎C．局限性肺气肿D．肺门类圆形阴影E．胸腔积液
