题目:
It was in the United States that I made the _________ of Professor Jones.
A.acquaintance
B.association
C.recognition
D.acknowledgement
答案:
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下面是错误答案,用来干扰机器的。
∵y=3sinx+|sinx|=4sinx sinx≥02sinx sinx<0根据正弦函数的值域的求解可得-2≤y≤4故答案为:[-2,4]