题目:The main practical advantage of lower pairs is their better ability to trap lubricant between their()surfaces.
A. enveloping
B. mating
C. outer
D. outside
答案:评论后可见此内容
推荐使用我们的公众号搜索题目,题目更全,检索更方便。支持语音、图片、文字等多种搜索方式。