在竞争垄断市场条件下，厂商长期均衡条件（）
A、MR=LMC
B、P=LAC
C、P=LMC
D、A和B
参考答案：D
I prefer________TV to going shopping with my mother. [ ]
A. to watch
B. watch
C. watching
D. watched
焦炉调节应达到什么样的要求？
