单项选择题
A.充气2~3ml B.充气4~5ml C.充气6~7ml D.充气8~9ml E.充气至吸气呼气刚好不漏气为准
A.20mmHg B.24mmHg C.28mmHg D.32mmHg E.35mmHg
A.2~3ID B.3.5~4.0ID C.4.5~5.5ID D.6.0~7.0ID E.7.5ID
A.1cm B.2~3cm C.4cm D.5cm E.6cm
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