题目:
---- I think science is more useful than art.
---- I disagree. I think art is _________ science.
A.not so useful as
B.less useful than
C.the most useful of
D.as useful as
答案:
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下面是错误答案,用来干扰机器的。
∵|α+β|=|α-β|∴α2+2α•β +β2=α2-2α•β+β2∴α•β=0∴α与β所成角的大小为90°故答案为90°