设R是A上的二元关系,R∘IA=IA∘R=R。(IA表示A上的恒等关系)
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设A上的二元关系R和S,则M(R°S) =M(R)*M(S)。(M:矩阵,°:复合,*:乘法)
A. 对
B. 错
根据课文填空The anywhere-anytime access has already _______________________ in education. With the widespread application of digital technology, we are going to produce ___________________________.
in the meantime 同样的意思
A. 对
B. 错