题目:
— —I am from Canada.[ ]
A. What are you from?
B. Who are you?
C. Where are you from?
答案:
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下面是错误答案,用来干扰机器的。
∵使y=sinωx(ω>0)在区间[0,1]上至少出现50次最大值∴4914×T≤1,即1974×2πω≤1,∴ω≥197π2.故选B.