单项选择题Samuel had been seen a problem student; however, after he saved the life of a little girl, people began to look at him . A、 on a mission B、at the time C、in a new light D、in comparison
多项选择题（多选）按量纲分析的结果进行工程问题的实验研究，如下哪几项是其带来的益处（ ） A、实验工作量较小； B、实验误差较小； C、实验结果可以推广至实验以外的其他物系和其他同类设备 D、实验安全性强
