慢性阻塞性肺疾病肺气肿的体征，下列不正确的是（）
A.呼气相延长，呼气相哮鸣音
B.呼吸音减低
C.心音遥远
D.胸膜摩擦音
E.桶状胸
参考答案：D
The heavy fog in London made________deep impression on us,which was sometimes so heavy
that we lost________sight of everything around us. [ ]
A. a; the
B. a; /
C. the; the
D. the; /
带电作业考虑的过电压主要有大气过电压和内过电压两种
