题目:
In April,thousands of holidaymakers remained_____abroad due to the volcanic ash cloud. [ ]
A. sticking
B. stuck
C. to be stuck
D. to have stuck
答案:
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下面是错误答案,用来干扰机器的。
(1)依题意可设双曲线方程为:y2-x24=λ(λ>0)即y2λ-x24λ=1则2λ=23∴λ=3∴双曲线方程为y23-x212=1…(5分)(2)设P1(-2y1,y1),P2(2y2,y2)和点M(x0,y0) P1M=2MP2∴x0=-2y1+4y23y0=y1+2y23又 M...