用无菌长棉签取粪培养标本时应插入肛门A.6~7cmB.8~9cmC.10~15cmD.16~18cmE.19~22cm

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问题 用无菌长棉签取粪培养标本时应插入肛门

选项

A.6~7cm
B.8~9cm
C.10~15cm
D.16~18cm
E.19~22cm


答案A

解析
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