少腹拘急冷痛，苔白，脉沉紧，治疗宜选
A．良附丸
B．附子粳米汤
C．暖肝煎
D．乌头桂枝汤
参考答案：C
If an oligopoly is characterized by fierce competition, in long-run equilibrium the firms in the market will earn:（）
A. zero economic profits.
B. substantial economic losses.
C. substantial economic profits.
“阳在外，阴之使也”说明阴阳之间的关系是（）
A.对立制约
B.互根互用
C.互为消长
D.平衡协调
E.互相转化
