欧____ 士____ 殊____ 救____ 载____
鸥____ 土____ 珠____ 球____ 栽____
①若m=n,则|m|=|n|;②若m=﹣n,则|m|=|﹣n|;③若|﹣m|=|﹣n|,则m=﹣n;④若|﹣m|=|﹣n|,则m=n.