The agonist PET ligand [11C]AF150(S) was rapidly taken up in the brain and showed an apparent specific M1ACh-R-related signal in brain areas that are rich in M1ACh-R. Moreover, binding of the agonist PET ligand [11C]AF150(S) appears to be sensitive to changes in extracellular ACh ...
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缩写词:在缩写词前使用“a”还是“an”,需视首字母发音而定。例如: F是辅音字母,但其发音以/e/开头(元音音素),故应说:an FM radio。 U是元音字母,但其发音以/j/音开头(辅音音素),故应说:a UN declaration。 总的来说,“a”用于辅音音素开头的单词前,而“an”则用于元音音素开头的单词前。需要注意的...
意大利数学家列昂纳多•斐波那契是第一个研究了印度和阿拉伯数学理论的欧洲人,斐波那契数列被誉为是最美的数列,斐波那契数列{an}满足:a1=1,a2=1,an=an-1+an-2(n≥3,n∈N*).若
∵数列{an}中2an+1-2an=1,∴数列{an}是公差为 1 2的等差数列,∴a101=a1+100d=a1+50.故答案为:a1+50. 利用等差数列的通项公式求解. 本题考点:数列递推式. 考点点评:本题考查数列的等101项的求法,是基础题,解题时要注意等差数列的性质的合理运用. 解析看不懂?免费查看同类题视频解析查看解答 ...
如图,CA⊥AB,垂足为点A,AB=8,AC=4,射线BM⊥AB,垂足为点B,一动点E从A点出发以2/秒的速度沿射线AN运动,点D为射线BM上一动点,随着E点运动而运动,且始终保持ED=CB,当点E运动___秒时,△DEB与△BCA全等. 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 ①当E在线段AB上,AC=BE...
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解答 解:∵等差数列{an}中,a3=1012与an=3112且d=70,∴a3=a1+2×70=1012,解得a1=872,∴an=872+(n-1)×70=3112,解得n=33.∴项数n的值为33. 点评 本题考查等差数列的项数的求法,是基础题,解题时要认真审题,注意等差数列的性质的合理运用.练习...
2.l'm going to the party only if you go tool'm not going___3.The dog will attack you only if you move suddenly4.He'll speak to you only if you ask him a question5.The doctor will see you today only if it's an emergency 答案 ...
A young father was visiting an old neighbor. They were standing in the old man’s garden, and talking about children. The young man said,“How strict should parents be with their children?” The old man pointed to(指着)a string (细绳) between a big strong tree and a thin young one....