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【简答题】
Match the words with their meanings. defender handball offside referee shooter striker touchdown (a) a football player whose main job is to score goal_____ (b) a player who aims the ball at the goal____ (c) an offence in football when you touch the ball with your hands____ (d) the act of taking a ball in American football over the other team’s goal line____ (e) a player who helps the goalkeeper stop the other team scoring goals____ (f) a person who makes sure that players obey the rules_____ (g) an offence where the striker receives the ball from a position between the opposing goalkeeper and defender_____
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举一反三
【单选题】有非平稳序列 ,其一阶差分序列经检验平稳、且样本 ACF 呈现拖尾性,样本 PACF 呈现 2 阶截尾性,则可初步认为对 应该建立( )模型 ,即对 其一阶差分序列 应该建立( )模型。
A.
ARIMA(2,1,0) ， AR(2)
B.
ARIMA(2,1,0) ， ARMA(1,2)
C.
ARMA(1,2) ， AR(2)
D.
AR(2) ， MA(2)