下列关于显示器场频的描述中，错误的是______。
A. 场频就是显示器的视频带宽
B. 场频=视频带宽/显示列数/显示行数
C. 场频越高，显示器的闪烁感越强
D. 场频就是显示器的垂直扫描频率
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合同一方当事人迟延履行主要债务的，其法律后果在于( )。
A. 对方当事人可以解除合同
B. 经对方当事人催告后在合理期限内仍未履行，则对方可以解除合同
C. 合同自动解除
D. 经过合理期限仍未履行，则合同自动解除
What does the passage mainly discuss
A. Disagreements on the meaning of folk music.
B. Elements that define folk music.
C. Differences between folk music and popular music.
D. Themes commonly found in folk music.
根据《合同法》的规定，( )可以有偿也可以无偿。
A. 保管合同
B. 融资租赁合同
C. 运输合同
D. 行纪合同
Which of the following statements is NOT mentioned in the passage as a typical feature of folk song
A. It is constantly changing over time.
B. It appeals to many people.
C. It contains complex musical structures.
D. It is passed on to other people by being performed.
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