【单选题】Body language can sometimes lead to_since people of different cultures often have different forms of behavior. for sending the same message or have different interpretations of the same signal
【简答题】设集合 A ={ a , b , c } , R ={( a , a ), ( a , b ), ( b , a ), ( a , c ), ( c , a ), ( c , c )} , S ={ ( a , b ), ( b , b ), ( b , c ), ( c , a ), ( c , c )} 均为 A 上的二元关系。 求: ( 1 ) R○S - 1 的关系矩阵 M ( R○S -...