双侧卵巢肿瘤，腹膜种植直径小于2cm，淋巴结(-)，其分期为：（）
A．Ic期
B．Ⅱb期
C．Ⅱc期
D．Ⅲb期
E．Ⅲc期
参考答案：D
For many years, people _____ electriccars. However, making them has been more difficult
thanpredicted. [ ]
A. had dreamed of
B. have dreamed of
C. dreamed of
D. dream of
A．若磁场正在增强，则电场能正在减少，电容器上极板带正电
B．若磁场正在减弱，则电场能正在增强，电容器上极板带正电
C．振荡电流的变化周期为：2π
D．电场能量的变化周期为：π
