问题 更新时间2024/5/30 12:57:00 The maipractical advantage of lower pairs is their better ability to trap lubricant betweetheir ______ surfaces.· enveloping· mating· outer· outside 答案 登录 注册 单选题· enveloping 出自:青书学堂 >> 佳木斯大学语言治疗学