竞技体操比赛中自由体操的场地面积为()。
A.12米×12米
B.13米×13米
C.12.5米×12.5米
参考答案:A
大隐静脉走行经()
A.内踝后方
B.内踝前方
C.外踝前方
D.外踝后方
E.以上全错
At the equilibrium levels of output and price in a competitive industry without taxes:()
A. consumer surplus is maximized.
B. producer surplus is maximized.
C. the sum of producer and consumer surplus is maximized.