若素材的帧速率为15FPS，而合成图像的帧速率为30FPS，则素材每向前走一帧，则合成图像显示（）
A.1帧
B.2帧
C.1/2帧
D.4帧
参考答案：B
An analyst does research about dividend distribution. All else being equal, the payment of a cash dividend most likely results in a decrease in the company's:
A. retained eamings.B. debt-equity ratio.C. debt-assets ratio.
表达式Lcase（left（“ABCDEFG”，5）的值是（）。
