In the short run, if price is below average total cost (ATC), the firm will:（）

A. keep running as long as it is covering its variable costs.

B. produce more.

C. raise prices.

急性前壁心肌梗死并发加速性室性自主律（）

A.异搏定

B.洋地黄

C.阿托品

D.利多卡因

E.胺碘酮下列疾病时宜选择的治疗药物为