A:has
B:have
C:having
— How much are the two pairs of trousers?— They are not expensive. I think one hundred dollars ______ enough.
(Ⅰ)化简:|a﹣b﹣c|+|b﹣c﹣a|+|c﹣a﹣b|;
(Ⅱ)若a+b=11,b+c=9,a+c=10,求这个三角形的各边.
规范的操作能保证化学实验的顺利进行.下列实验操作正确的是( )