Complete the sentences with the correct expressions of the following given words: assure You may ____that we will keep you informed of the execution of your order. We can ____you ____the best quality of our goods.
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举一反三
【简答题】设R是集合A上的等价关系,则对任一元素a∈A,集合a形成的R等价类[a] R =______.