钟表的分针和时针在3点到5点40分这段时间里，分针转过了（ ）弧度的角，时针转过了（ ）弧度的角。
-π；-π
-What were you doing when I called you at 8 o'clock yesterday?
-I _________ the violin at that time.[ ]
A. play
B. is playing
C. played
D. was playing
传统营销模式，一般是营销战略支配营销战术，而逆向市场营销则是（）
A．营销战术支配营销战略，然后战略推
B．营销战术等同于营销战略动战术
C．只考虑营销战术
D．营销战术不能对经营产生创意
π；-
π
π；-π