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【单选题】
有关呕血和黑便不正确的是:
A.
呕血一般都有黑便
B.
24h消化道出血量>5ml时,大便隐血试验阳性
C.
24h消化道出血量60ml,可出现黑便
D.
有黑便不一定有呕血
E.
幽门以上部位出血以黑便为主
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举一反三
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A.
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B.
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