单选题：知识点：对先天性肥厚胃蠕动波对于先天性肥厚性幽门狭窄叙述错误的是

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知识点：对先天性肥厚胃蠕动波
对于先天性肥厚性幽门狭窄叙述错误的是 A．症状出现在生后2—4周，极少发生于出生4个月之后
B．呕吐是主要症状。最初仅是吐奶接着是喷射性呕吐
C．在喂奶后可见到膨胀胃的蠕动波，波形出现于右肋下缘到脐的左上方消失
D．80％以上可以摸到幽门肿块
E．体重起初不增。继而迅速下降。日渐消瘦，出现营养不良和失水

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