【单选题】In bolt connection, the nominal diameter of the bolt is 20 mm, the thickness of two parts is 30mm and 32mm respectively, and the washer thickness is 3 mm. Determine the nominal length of the bolt. (Si...
【单选题】听力原文:M:I was looking at my test score and think that it should be higher.I think an answer got marked wrong that should have been marked right. W:These things can happen;let's double-check the answers...