省煤器管有局部磨损不超过1cm2其深度不超过管壁厚的30％时，可进行堆焊补强。
参考答案：对
She _____ catch the bus every morning, but now she rides with her friend. [ ]
A. used to
B. is used to
C. use to
D. was used to
运动试验中无论发生于何时均属异常的症状是（）。
A.胸痛
B.疲劳
C.出汗
D.轻度呼吸困难
E.气喘
