Based on the thread designation M20, choose a word in the parenthesis to fill the blank (left-hand thread, right-hand thread).This thread is _____. (Fill the blank 10 Points)
Based on the thread designation M20, choose a word in the parenthesis to fill the blank (left-hand thread, right-hand thread).This thread is _____. (Fill the blank 10 Points)
发布时间：2025-07-21 18:22:32
