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1. classes 2. boxes 3. teaches 4. washes 5. goes 6. does 7. watches 该题考查英语单词的复数形式。以s、x、ch、sh结尾的单词,在词尾加“es”构成复数形式。因此,class变为classes,box变为boxes,teach变为teaches,wash变为washes,watch变为watches。以o结尾的单词,go变为goes,do变为does。最终答案...
答案:C 2.《中华人民共和国禁毒法》第四条规定:禁毒工作实行( )为主,综合治理,禁种、禁制、禁贩、禁吸并举的方针。 A.预防 B.打击 C.救治 D.惩罚 答案:A 3.《中华人民共和国禁毒法》规定,教育行政部门、( )应当将禁毒知识纳入教育、...
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Ch.,Venkat,Reddy,Jesudoss,V.,Kingston,John,G.,Verkade 摘要: By employing Pd(OAc)2, Cs2CO3, or NaOH, and the new ligand (t-Bu)2PNP(i-BuNCH2CH2)3N (3a), an electronically diverse array of aryl bromides and chlorides possessing base-sensitive substituents (nitro, ester, and keto) ...
进入答题系统后,点击“开始答题”按钮,系统将自动抽取2024年全国青少年禁毒知识竞赛题库题目生成10道题,每题10分、满分100分,限时3分钟答完。 答完后,系统即时报出答题对错情况、正确答案及最终得分。答题者在按动“开始答题”之前的所...
There is no η2-olefin intermediate on the reaction path. DFT calculations seeking the energy and structure of the two carbenes Cp2ZrHCl[CF(CH3)] and Cp2ZrFCl[CH(CH3)] are also described. 展开 DOI: 10.1021/ja0024340 被引量: 1 年份: 2001 ...
Enumerates the services available in Visual Studio 2022 Update 2.C# Copia [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)] public class VisualStudioServices.VS2022_2Services : Microsoft.VisualStudio.VisualStudioServices.VS2022Services...
Complexes of the general formula [{AuL}3{μ-(CC)3Ar}] can be obtained from 1 and excess isocyanide (L = tBuNC (2), XyNC (3)), by treating 2 with an excess of NHEt2 (L = C(NHtBu)NEt2 (4)), or by reacting [Ar(CCH)3] with [Au(acac)PPh3] (1:3, L = PPh3 (5)) ...
Energetically low-lying silacyclopropyne isomer of SiC/sub 2/ We have discovered a low-lying cyclic isomer of Si--C--C which is best described as a three-membered ring with a weak carbon--carbon triple bond. In these ... RS Grev,H. Schaefer - J. Chem. Phys.; (United States) 被...