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【多选题】
有关乳房结构的描述，哪项不正确A.
中央的突起为乳头, 表面有输乳管开口
B.
乳头周围色素较深的环状区为乳晕
C.
主要由15-20个乳腺叶组成
D.
每个乳腺叶由许多腺泡组成，腺泡发出输乳管开口于乳头
E.
输乳管在乳头皮下扩大成输乳管,并开口于乳头
F.
15-20 个乳腺叶以乳头为中心呈放射状排列
G.
当乳房内脓肿等手术时,乳头为中心作放射状切口,以免切断输乳管
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A.
were there
B.
were it
C.
weren't there
D.
weren't it
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A.
正确
B.
错误
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A.
正确
B.
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A.
正确
B.
错误
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