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【多选题】
以下关于在效果控件面板中对视频转场特效做进一步设置描述正确的（ ）
A.
默认状态下，转场都是A到B完成的
B.
要改变转场部分的开始和结束状态，可以拖动“ 开始 ”和“ 结束”滑块
C.
选择“ 显示实际源 ”选项，可以在转场设置对话框上方“开始”和“结束”窗口中显示转场的开始和结束帧
D.
选择“反向”选项的话，可以改变转场的顺序，由 A到 B的转场切换会变为由 B至A
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