下列各项中属于成本构成要素费用的是（）
A.材料费用要素
B.动力费用要素
C.人工费用要素
D.制造费用要素
参考答案：A, B, C, D
Read and fill in the blanks. 请用所给词的适当形式填空。
1. The cow is walking ____ (slow).
2. Tom ____ his leg yesterday. (hurt)
3. These boys are____ loudly now. (talk)
4. I can't take a picture. It is____. (easy的反义词)
5. The ____ are buying storybooks. (child)
湿热灭菌法中效果最好的是（）
A.高压蒸汽灭菌法
B.流通蒸汽法
C.间歇灭菌法
D.巴氏消毒法
E.煮沸法
