【单选题】Which of the following are necessary if forecasts obtained from a time series analysis are to be reliable? (i) There must be no unforeseen events (ii) The model used must fit the past data (iii) The t...
【简答题】句型转换,每空一词。 1. Could you give me some water? (改为祈使句) _____ _____ some water, please. 2. Please buy me a new bike. (同义句转换) Please _____ a new bike _____ me. 3. The w atch is 100 yuan . (对划线部分提问) _____ i...