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答案:B 8.毒品预防教育的重点对象是( )。 A.青少年 B.老人 C.幼儿 D.妇女 答案:A 9.我国禁毒工作的治本之策是( )。 A.预防教育 B.依法严厉打击 C.切断毒品来源 D.戒断治疗 答案:A 10.下面表述正确的是( )。 A.禁毒主要是人民...
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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) provide coupling products with bulky aryl amines in good to excellent...
Book Google Scholar Yin Q (2012) Dongzhou shiqi qin qi xunrenmu de bijiao yanjiu (The comparative study of sacrificial burials of Qin State and Qi State in the Eastern Zhou period). In: Shandong University (ed) East Asia Archaeology. Science Press, Beijing, pp 316–325 Google Scholar ...
Various 1,1-difluoro-1-alkenes such as monosubstituted 1,1-difluoro-1-alkenes, 2-bromo-1,1-difluoro-1-alkenes, and 3,3-difluoroallylic alcohols are synthesized in two simple steps from 1-trifluoromethylvinylsilane: (i) its SN2' reaction with nucleophiles to construct 2,2-difluorovinyl...
Explore book Obtaining regulatory approval to market PeterOgrodnik, inMedical Device Design (Second Edition), 2020 15.2Class I devices In previous chapters we saw the classification process. The obvious starting point for all applications is the confirmation of the device's classification. The easiest...
© 2011 Springer Science+Business Media, LLC About this chapter Cite this chapter Belguesmia, Y., Naghmouchi, K., Chihib, NE., Drider, D. (2011). Class IIa Bacteriocins: Current Knowledge and Perspectives. In: Drider, D., Rebuffat, S. (eds) Prokaryotic Antimicrobial Peptides. Spring...
New hydrocarbon bridged co-condensation agents of the type MeSi(OMe)2(CH2)z(MeO)2SiMe [1(D0−Cz−D0), z = length of the flexible bridging group (z = 6, 8, 14)] were synthesized and polycondensed to give the polysiloxanes 1(Di−Cz−Di). These monomers were employed in varia...