【单选题】【消耗次数：1】
墙面抹灰的总厚度要有一定的要求，外墙抹灰一般为（ ），内墙为（ ）。
①
20~25mm，15~20mm
②
5~20mm，20~25mm
③
20~25mm，15~25mm
参考答案：
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