操作条件反射学说的提出者是巴甫洛夫。( )
参考答案：错
— _____ do you like best?
— Orange, because orange can bring me success. [ ]
A. What
B. Why
C. Which
D. What colour
验算组合梁刚度时，荷载通常取（）
A.标准值
B.设计值
C.组合值
D.最大值
