碳钢及低合金钢消除应力的高温回火温度一般是()℃。
参考答案:580--680
We have T-shirts_______red, white, orange and blue______only 25 dollars. [ ]
A. in; for
B. with; at
C. in; on
D. at; for
烟气脱硝系统不仅要满足相关法律标准要求,还要满足那些条件?