为了保证材料的强度，低碳调质钢消除应力处理的温度应该比原来的回火温度低30℃左右。
参考答案：对
Tim had one of his legs broken when he fell off a ladder and has been ____ ever since. [ ]
A. badly off
B. well off
C. worse off
D. better off
单层厂房支撑体系的作用是什么
