单项选择题 进行文本分类训练时，训练集与测试集的规模： A、一般训练集大于测试集 B、一般测试集大于训练集 C、差不多 D、无所谓

单项选择题 PX Co is considering making a takeover bid for JJ Co. Both companies are large listed sportswear retailers that sell to the general public. The shares of both PX Co and JJ Co are regularly traded and their share prices react quickly to new information. Which of the following is likely to be needed to allow PX Co to make sure that its bid is not too high? A. No information is needed because the stock market is semi-strong form efficient  B. Estimates of the present value of the synergies that are likely to result from the takeover  C. An aged accounts receivable summary  D. The latest published statement of JJ Co's financial position

判断题 在波的传播过程中，参与波动的质点沿着介质由近及远的向前传播。