[问答题] 简述间隙对断面质量的影响。

简述冲模具间隙对冲压制件的尺寸精度的影响。 A port is（）if the delay in leaving it would be such as to frustrate the adventure． ["not good","unsafe","safe","obtainable"] 介绍礼仪的方式方法有哪些？ 参加宴请时，宴请方致词时应注意什么？ A port（）if more than ordinary prudence and skill is needed to avoid exposure to danger there. ["safety","is safe","is not safe","is not safety"] 简述间隙对断面质量的影响。