已知数列{an}中,a1=12,对一切n∈N+,点(n,2an+1-an)在直线

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问题:

已知数列{an}中,a1=
1
2
,对一切n∈N+,点(n,2an+1-an)在直线y=x上,
(Ⅰ)令bn=an+1-an-1,求证数列{bn}是等比数列,并求通项bn
(Ⅱ)求数列{an}的通项公式an
(Ⅲ)设Sn、Tn分别为数列{an}、{bn}的前n项和,是否存在常数λ,使得数列{
SnTn
n
}
为等差数列?若存在,试求出λ若不存在,则说明理由.
考点:等比数列的定义及性质数列求和的其他方法(倒序相加,错位相减,裂项相加等)
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患者男性,52岁,隐袭起病的对称性近端肌无力,伴血清肌酸激酶升高及颜面、前胸上部充血性皮疹,下列哪种疾病的可能性最大

A.运动神经元病

B.重症肌无力

C.感染性肌病

D.周期性瘫痪

E.皮肌炎

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水液运行的通道是()。

A.经脉

B.络脉

C.腠理

D.三焦

E.气门

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此时最适宜的治疗为

A.胃癌根治术

B.胃大部切除术+肝转移癌切除术

C.姑息性手术

D.大剂量化疗

E.放疗

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Ngoni, an engineering graduate, has invented a highly secret and efficient process for borehole and water drilling. The device was superior but less expensive than similar devices on the market. He secured contracts with several large companies to market his device and went to great expense to retool his operations for production at the same time. Ngoni ordered from a manufacturer, Mhizha Enterprises, a consignment of plastic component parts which were needed in the manufacturing of said equipment for borehole and water drilling. Mhizha Enterprises received instructions to produce the parts by a specific date. The manufacturer failed to deliver the parts on time as he had discovered that he did not have the capacity to do so in the agreed time. Ngoni had no other alternative sources of supply and therefore lost several lucrative contracts he had arranged. The contracts are worth US$50,000.Required:In relation to the law of contract, advise whether Ngoni can sue Mhizha Enterprises for breach of contract, and whether the claim can include the loss of sales as damages. (10 marks)

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男性,35岁,体重70kg,矿工,瓦斯爆炸烧伤,面颈(头部除外)、双上肢、双下肢(臀部除外)深度烧伤,伤后2小时送至医院。

首次手术应考虑()

A.颜面部

B.双手

C.双上肢

D.四肢

E.双足

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