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最常见的异位胃黏膜好发于
答案：
答案：最常见的异位胃黏膜好发于十二指肠球部。异位胃黏膜（Heterotopic gastric mucosa）是指胃黏膜...
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问答题
words undertake the task of fulfilling grammatical functions while concrete meaning is not an essential part of their properties.
答案：
答案：The words you are referring to are known as function word...
