题型:名词解释 The little boy is not old enough to look after ______. [ ]A. himB. himself C. his own D. herself 查看答案
题型:名词解释 属于胀形工艺特点的有()。A、塑性变形区仅局限于一个固定的变形范围内B、一般情况下,变形区的工件不会产生失稳或起皱现象C、材料塑性越好,延伸率越大,则胀形的极限变形程度越大D、材料处于双向压应力状态 查看答案