A. He is cleaning the street B. He is forty C. He is a farmer D. He is all right
A. 流通蒸汽消毒法 B. 间歇灭菌法 C. 高压蒸汽灭菌法 D. 煮沸消毒法
A. 5 B. 10 C. 30 D. 60