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【简答题】
简述商行为的含义及其特征。(中山大学2011年研；西北政法2007年研)
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【多选题】如果随机过程X(t)是广义平稳的,那么它一定具有_______特点。
A.
自相关函数与时间起点无关
B.
满足各态历经的性质
C.
严格平稳
D.
均值是常数
E.
自相关函数与时间间隔有关
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【单选题】通信中遇到的随机过程大多是广义平稳随机过程,判断广义平稳的条件是
A.
n维概率密度函数与时间起点无关
B.
n维概率密度函数与时间起点有关
C.
方差是常数，自相关函数与时间起点有关
D.
数学期望是常数，自相关函数只与时间间隔有关
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