怎样为业户提供维修服务？

A. 符离集烧鸡
B. 吉首酸肉
C. 红椒腊牛肉
D. 淡槽香螺片

A. 毛血旺
B. 酸菜鱼
C. 佛跳墙
D. 红椒腊牛肉

A. 2
B. 3
C. 4
D. 5

A. Foam conducts electricity
B. To be most effective，foam should be directed at the base of the fire
C. Foam is most effective on burning liquids which are flowing
D. Foam can ONLY be used to extinguish class A fire