电影《铜雀台》中，饰演曹操的是哪位著名香港著名电影明星？
参考答案：
周润发
Put the following events_______ according to the time when they happened and then putthem
______ of their importance in history. [ ]
A. in order; in order
B. in the order; in an order
C. in an order; in order
D. in order; in order
A．时刻t线圈中电流的瞬时值icosωt
B．线圈中电流的有效值I
C．线圈中电流的有效值I=
D．线圈消耗的电功率P
cosωt
