A technology that all of the firms in a perfectly competitive industry are using in their production process has been banned by new legislation. What will most likely be the effect if these firms stop using this technology（）

A. The quantity that the industry will supply at a given price will be reduced.

B. Firms will adopt a different technology that reduces their costs of production.

C. The number of firms in the industry will increase market price.

发生慢性中毒的基本条件是毒物的（）。

A.剂量

B.蓄积作用

C.靶器官

D.选择作用

E.作用时间