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【单选题】
若两事件A和B同时出现的概率P(AB)=0,则( )A.
A和B互补相容
B.
A、B是不可能事件
C.
A、B未必是不可能事件
D.
P(A)=0或P(B)=0
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举一反三
【单选题】Which of the following is true about the persistence method?
A.
The method will work well if weather conditions change greatly from day to day.
B.
It is the st and the best way of producing a forecast.
C.
It is impossible to use the method because weather condition changes constantly.
D.
The root of the frequent failure of the method is the assumption on which it is based.
【简答题】新事物是指符合_____的事物。
【单选题】Which method may involve historical weather data?
A.
The trends method.
B.
The og method.
C.
Both climatology method and og method.
D.
The trends method and the persistence method.
【单选题】Does the method he put forward______the problem make any sense?
A.
settle
B.
settling
C.
to settle
D.
settled
【单选题】下列有关直线回归方程Y=a+bX的描述中不正确的是。
A.
决定回归线的两个系数是a和b
B.
a＞0表示直线与纵轴的交点在原点上方
C.
b＞0表示直线从左下方走向右上方
D.
b=0表示直线通过原点
E.
回归线必通过点（X，Y）
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