作出图中不倒翁的受力示意图（O为不倒翁的重心）．
重力G的作用点在重心，方向是竖直向下，支持力F的作用点在接触面上，方向向上．
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
A 35-year-old female client who complains of weight gain, facial hair, absent menstruation, frequent bruising, and acne is diagnosed with Cushing's syndrome. Cushing's syndrome is most likely caused by which of the following
A．An ectopic corticotropin-secreting tumor.
B．Adrenal carcinoma.
C．A corticotropin-secreting pituitary adenoma.
D．An inborn error of metabolisrn.
