【单选题】(P93)★五四运动的直接导火线是( )
【简答题】在等比数列 中,已知 ,公比 ,等差数列 满足 . (Ⅰ)求数列 与 的通项公式; (Ⅱ)记 ,求数列 的前2n项和.
【简答题】在等比数列 中,已知 ,公比 ,等差数列 满足 . (Ⅰ)求数列 与 的通项公式; (Ⅱ)记 ,求数列 的前n项和 .
【单选题】We have no festival, nor ______, nor ceremony, not so-called Thanksgivings, by which the farmer expresses a sense of the sacredness of his calling, or is reminded of its sacred origin.
【单选题】在小腿内侧,当胫骨内侧踝后下方凹陷处的穴位是: