计算题：焊条电弧焊时，焊缝成形系数，测得焊缝宽度为5mm，求焊缝的计算厚度H？
参考答案：
The young man admitted, after several hours questioning, ______ a wallet from the passenger on the bus. [ ]
A. having stolen
B. to have stolen
C. being stolen
D. to steal
真菌用Schiff染色法显示为（）
A.紫色
B.红色
C.蓝色
D.绿色
E.紫红色
