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【单选题】
慢性阻塞性肺气肿时语音震颤的改变是:A.
一侧增强
B.
一侧减弱
C.
双侧正常
D.
双侧减弱
E.
双侧增强
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A.
正确
B.
错误
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【简答题】根据燃料的性质和大气污染物的组成,把大气污染分为( )、( )、( )和( )四大类。
【简答题】最基本的逻辑门电路是 、 和非门
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