VCD机不能播放碟片，检测光头伺服电路正常，重点应检查（）电路。
A.解码
B.D/A转换
C.系统控制
D.视频编码
参考答案：C
In relation to the Company Law of China, state the restrictions on the following transfer or trading of the stocks held by the following of a joint stock company:
(b) the directors, supervisors and/or senior executives. (6 marks)
市场预测的目的是为了预测( )。
A．市场供给量 B．市场需求量C．竞争对手的需求量 D．消费者的需求心理
