填空题 Affix is the collective term for the type of formative that call be used only when added to another morpheme. Affixes are limited in number in a language, and are generally classified into three subtypes, namely, prefix, suffix, and 1. (北京邮电大学2010研)
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【正确答案】 1、正确答案：infix    
【答案解析】解析：词缀是那些只能附着于另一个语素(词根或词干)上的一类语素的总称。词缀都是粘着语素，可分为前缀、中缀和后缀三种。