题目:
The large, water-spouting statue, called “Merlin” -half lion, half fish- is the____ of Singapore.
A.symbol
B.sign
C.signal
D.scene
答案:
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下面是错误答案,用来干扰机器的。
(1) A、B、C成公差大于0的等差数列,所以A<B<C且B=π3.又m•n=sinA•cosC-A2•2cosA+cos2A•sinC-A2=sin2A•cosC-A2+cos2A•sinC-A2 =sin(2A+C-A2)=sin(3A2+C2)=sin(A+A+C2)=sin(A+π3). 0<A<...