随碳素结构钢的牌号增大,则其()。A.σs、σb增大,δ减小; B.可焊性降低; C 发布时间:2017-06-29 21:49 │ 来源:www.tikuol.com 题型:单项选择题 问题: 随碳素结构钢的牌号增大,则其()。A.σs、σb增大,δ减小;B.可焊性降低;C.δ增大;D.(A+B)
题型:单项选择题 -Many students don't know how to stress and become worried. -I think they'd better ask their teachers for help. [ ]A. argue with B. deal with C. quarrel with D. come up with 查看答案