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【单选题】
患者,女,40岁,慢性支气管炎,在闻到探视者带来的鲜花时,哮喘发作,自感胸闷,气急,有痰不易咳出,具有喘憋感,呼吸30次/分。该患者呼吸困难的特点为( )
A.
潮式呼吸
B.
间断呼吸
C.
吸气性呼吸困难
D.
呼气性呼吸困难
E.
混合型呼吸困难
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【单选题】以R134a代替过去常用的氟利昂作制冷剂，下列说法不对的是（）。
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【单选题】以R134a代替过去常用的氟利昂作制冷剂，下列说法不对的是
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必须改用适于它的脂类润滑油      
B.
不能用卤素捡漏灯        
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【单选题】以R134a代替过去常用的氟利昂作制冷剂,下列说法不正确的是 。
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必须改用适于它的脂类润滑油
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【单选题】以R134a代替过去常用的氟利昂作制冷剂,下列说法不对的是 。
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