S1:Would you please tell me your restricted area? S2:Yes,They are bridge, engine room and accommodation space. Q:Which of the following is not restricted area? A. Bridge B. Mess room C. Accommodation space D. Engine room
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【单选题】We propose to furnish our own house according to our own taste.
【简答题】数列{a n }是公比为 的等比数列,且1-a 2 是a 1 与1+a 3 的等比中项,前n项和为S n ;数列{b n }是等差数列,b 1 =8,其前n项和T n 满足T n =n ·b n+1 ( 为常数,且 ≠1). (I)求数列{a n }的通项公式及 的值; (Ⅱ)比较 + + + + 与了 S n 的大小.