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答案:A 7.《中华人民共和国禁毒法》规定,根据医疗、教学、科研的需要,依法可以( )、经营、使用、储存、运输麻醉药品和精神药品。 A.种植 B.生产 C.销售 D.研发 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....
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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...
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...
She’s in her second year and hopes to use her science background to get into intellectual property litigation. “It’s kind of weird being in an academic environment without Tubestock, Milque & Cookies, or a death slide, but I’m adjusting. There is actually another Dartmouth alum in my...
Class 11 science all chapter syllabus Reply Om Mishra March 24, 2023, 6:35 a.m. 123456 Reply Vishal Kharadi Feb. 20, 2024, 6:35 a.m. Hy 11 .8 .12 . Chapter ke notes Reply Harris March 2, 2023, 5:48 p.m. Hello! If you're in need of data scraping services, I'...
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...
class除了表示“班级”的意思,还会有“等级、阶级、阶层、类别、等级制度”等意思。 最开始的时候指的古罗马打仗期间召集起来的一群一群士兵,在军队里有各种各样的等级,它后来指古罗马社会里把人分成的6个等级,再后来就是现在的用法。 今天我们就用单词class来旧辅新知...