珠光体耐热钢焊接性差是因为钢中加入了()元素A.Si Mn B.MO Cr C.Mn 发布时间:2017-08-01 11:07 │ 来源:www.tikuol.com 题型:单项选择题 问题: 珠光体耐热钢焊接性差是因为钢中加入了()元素A.Si MnB.MO CrC.Mn PD.S Ti
题型:单项选择题 After work I went to the box office to buy the tickets for Kungfu Panda 2, only to be told there was ______ left. A.nothingB.noneC.no oneD.neither 查看答案