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【单选题】
患者，男，29岁。因药物过量进入重症监护治疗病房（ICU），给予患者呼吸机治疗，参数设置为潮气量（VT）750ml，呼吸10次/分。患者没有自主吸气动作。测得分钟通气量是6L，气道峰压为30cmH2O。这台呼吸机通气回路的压缩系数是（）。A.
1ml/（cmH2O）
B.
2ml/（cmH2O）
C.
4ml/（cmH2O）
D.
5ml/（cmH2O）
E.
7ml/（cmH2O）
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