①指大海波浪翻滚,景象壮观。____
②绿色的硬玉,半透明,有光泽。____
③从地面上突起。____
④原形容水面辽阔。 现比喻声势雄壮或规模巨大。____
如图表示同一只手遇火时产生缩手反射的过程模式图,请据图回答:
(Ⅰ)证明数列{an+1}是等比数列,求数列{an}的通项公式;
(Ⅱ)记bn= 1an+1 + 1anan+1 ,求数列{bn}的前n项和Tn.
I ______ have worried before I came to the new school, for my classmates here are very friendly to me.