若数列{a n }满足 a 2n+1 - a 2n =d(其中d是常数,n∈N ﹡ ),则称数列{a n }是“等方差数列”.已知数列{b n }是公差为m的差数列,则m=0是“数列{b n }是等方差数列”的______条件.(填充分不必要、必要不充分、充要条件、既不充分也不必要条件中的一个)
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【简答题】根据图片提示填空。 1. Beaches have ____________. I will make things with the ____________. 2. I will wear my new ____________. 3. It is very hot today. I like to wear my ____________. 4. I will put on my _____...