第15题: [单项选择]设在因子共有r个水平,每个水平下抽n个单位的样本数据。则() A. SST、SSA和SSE的自由度分别是:(nr-r)、(r-1)、(nr-r) B. SST、SSA和SSE的自由度分别是:(nr-1)、(r-r)、(nr-1) C. SST、SSA和SSE的自由度分别是:(nr-1)、(r-1)、(nr-r) D. SST、SSA和SSE的自由度分别是:(nr-1)、(nr-r)、(r-1) 参考答案:C
第16题: [单项选择]Passage Two Questions 29 to 31 are based on the passage you have just heard. A. The ultimate content remains the same. B. The vitamin content is reduced. C. The food becomes poisonous. D. Vitamin is added to the food. 参考答案:B 答案解析:[听力原文] What change will take place when food is processed