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【单选题】
设二维随机变量（X，Y）的分布律为【图片】则E（XY）为A.
B.
0
C.
D.
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举一反三
【简答题】Language has many functions. We can use language to talk about itself. This function is ________.
【判断题】The design feature of arbitrariness of language means we can use language to talk about anything we like.
A.
正确
B.
错误
【简答题】Language has many functions. we can use language to talk about itself. This function is _____.
【单选题】language has many functions. We can use language to talk about itself. This function is
A.
phatic
B.
emotic
C.
poetic
D.
metalingual
【简答题】Language has many functions. We can use language to talk about itself. This function is ______ function.
【简答题】We can use language more ____(effective).
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