尘肺中最多见且危害最大者为()
A.矽肺
B.煤工尘肺
C.石墨肺
D.滑石肺
E.铝尘肺
参考答案:A
—When did the famous writer die?
—In 1988. He _______ for twenty-two years. [ ]
A. has died
B. has been dead
C. died
D. is dead
二尖瓣关闭不全()。
A.心尖区舒张中晚期隆隆样杂音
B.心尖区全收缩期吹风样杂音
C.胸骨左缘3肋间舒张早期哈气样杂音
D.胸骨左缘2肋间3级以上喷射性收缩期杂音
E.胸骨左缘功能性收缩期杂音