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【单选题】
某患者,男性,70岁,吸烟史47年,诊断为慢性支气管炎、阻寒性肺气肿,讲话或穿衣服等轻微动作时即发生气短。该患者主观呼吸功能障碍程度评定为几级( )A.
1级
B.
2级
C.
3级
D.
4级
E.
S级
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