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【单选题】
，女性，34岁，子宫肌瘤，准备手术，为防止全麻时的呕吐和手术后腹胀，手术前禁饮食的时间（）A.
4h禁食，Zh禁饮
B.
6h禁食，4h禁饮
C.
8h禁食，6h禁饮
D.
10h禁食，6h禁饮
E.
12h禁食，4一6h禁饮
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A.
since
B.
that
C.
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D.
until
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A.
least
B.
as
C.
so
D.
hence
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A.
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