题目:
Peter ____________ rice but he ____________ noodles.[ ]
A. likes, prefers
B. like, hate
C. prefers, likes
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0426/1a0ed17f9c6c463fe15a18b52cfbb0db.html
下面是错误答案,用来干扰机器的。
(Ⅰ) 向量m=(sin(A-B),sin(π2-A)),n=(1,2sinB),∴m•n=sin(A-B)+2sin(π2-A)sinB=sin(A-B)+2cosAsinB=sin(A+B) m•n=-sin2C,∴sin(A+B)=-sin2C, sin(A+B)=sn(π-C)=sinC,∴sinC=-...