统计行政处罚的种类有（）
A、罚款
B、警告
C、没收违法所得
D、责令停产停业
E、责令改正
参考答案：A, B, C
As time went by, they found their efforts to help students ________. [ ]
A. showed off
B. took off
C. put off
D. paid off
如何测量光功率？
