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【单选题】
下列关于食道狭窄的描述,错误的是?A.
食道狭窄的特征是吞咽困难，咽水正常，连续大量采食突然停食
B.
食道狭窄的特征食糜、水溢出食道，积聚
C.
食道狭窄的特征是食物反流
D.
食道狭窄的特征是颈部狭窄前方团块状物膨出
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A.
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guaranteed
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D.
conveyed
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A.
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B.
have been uncovering
C.
areuncovering
D.
have uncovered
【简答题】27O转换成二进制等于
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