21、21．初乳是指A．产后3天内的乳汁B．产后7天内的乳汁C．产后10天内的乳汁D．产后14天内的乳汁
21、21．初乳是指
A．产后3天内的乳汁
B．产后7天内的乳汁
C．产后10天内的乳汁
D．产后14天内的乳汁
参考答案和解析
A
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