供应AN-13D3-13H M2D2D2AC NG5U0C/LS断路器AH-13D3-13A 厂家冲量 价格说明 价格:商品在平台的展示标价,具体的成交价格可能因商品参加活动等情况发生变化,也可能随着购买数量不同或所选规格不同而发生变化,如用户与商家线下达成协议,以线下协议的结算价格为准。 特别提示:商品详情页中(含主...
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18.(1)由 3a:-2a 得 3a:+2a:q=a:q^2 .即 q^2-2q-3=0 . 因为an0.则q0.所以q=3.由 S_1=13a_1+4 .得 (a_1(1-3))/(1-3)=13a⋅9+1 .则 a_1=1 .所以 a_n=3^n . (2)由题设及(1)得b1=1,且当 3'':≤m≤3^n 时, b_m=n ,即 b_1=b_1-1 . b_n=...
15.已知等比数列{an}的公比为q,前n项和为S_n,a_n0,3a_2+2a_3=a_4,S_5=13a_3+4 .(1)求{an}的通项公式;(2)记数列 (a_n
英文名称:(1R,3aS,5aR,5bR,7aR,8R,9S,11aR,11bR,13aS,13bR)-9-hydroxy-8-(hydroxymethyl)-1-isopropenyl-5a,5b,8,11a-tetramethyl-1,2,3,4,5,6,7,7a,9,10,11,11b,12,13,13a,13b-hexadecahydrocyclopenta[a]chrysene-3a-carboxylic acid ...
四氢小檗碱 5,8,13,13a-tetrahydro-9,10-dimethoxy-6H-benzo[g]benzo-1,3-dioxolo[5,6-a]quinolizine 522-97-4 - CAS数据库
13A.3 An overview of operational FNMOC mesoscale cloud forecast support (2009 - 23WAF19NWP_23waf19nwp)In response to customer demand, Fleet Numerical Meteorology and Oceanography Center (FNMOC) began distributing explicit mesoscale cloud forecasts from the Coupled Ocean/Atmosphere Mesoscale Prediction ...
13A}。。man。§2hid:hidddd, nt m an mn hn, m on llhand ath ath an chd adndln 相关知识点: 试题来源: 解析 【解析】 (1).【答案】c 【解析】 根据上下文分析可知本题的意思是:他正在吹萨克 斯,本题考查的是语境的理解能力,故本题应选 C. (2).【答案】 d 【解析】 根据上下文分析...
百度试题 结果1 题目Where are you from?13A I'm from an3 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
The present invention is drawn to a device for the transdermal administration of dextromethorphan, (+)-3-methoxy-17-methyl-9a,13a,14a-morphanin, and salts, prodrugs and metabolites thereof, together with a pharmaceutically acceptable carrier, to a human being or animal in need thereof, to achie...