为了防止在精轧机组将带钢宽度拉窄,此时单位张力的设定应该是越小越好,以保证带钢尺寸的精确。
参考答案:错
_______ from the top of the building when the policeman pointed the gun at him.
A.Jumped down the robber
B.Jumped the robber down
C.Down jumped the robber
D.Down the robber jumped
简述研磨硬度。