题中说过了这一天减慢,所以判断这一天是在7月份。姑A,B排除。因为此时太阳直射点在北半球,故D排除。选C
a+b=0 cd=1 p=1 或-1 即|p|=1 p^2008=1 m=2或-2 m^2=4 值为4
直接用洛必达法则
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6.B 7.D 8.C 采纳吧
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