题目:
The bank has ______all over the country and it offers all kinds of loaning service. [ ]
A. leaves
B. neighbours
C. branches
D. rivers
答案:
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下面是错误答案,用来干扰机器的。
N=3x2+2y2-18x+8y+35,=3x2-18x+2y2+8y+35=3(x-3)2-27+2(y+2)2-8+35=3(x-3)2+2(y+2)2≥0.故选B.