男性,71岁。吸烟史40年,3个月来出现咳嗽,以高亢的干咳为特点,伴有呼吸困难,最可能的诊断()
A.气管炎
B.肺脓肿
C.肺癌
D.哮喘
E.肺炎
参考答案:C
(2013·新课标Ⅰ,21)—Why,this is nothing but common vegetable soup!
—________,madam.This is our soup of the day.
A.Let me see
B.So it is
C.Don't mention it
D.Neither do I
变压器分接开关的作用及原理是什么?