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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、教学内容...
Seagrass biology. Proceedings of an International Workshop, Rottnest Island, Western Australia. 25–29 January 1996, pp. 71–78. Perth. Google Scholar Weigleb G. 1988. Notes on pondweeds, outline for a mono-graphical treatment of the genus Potamogeton L. Feddes Repert. 99: 249–266. ...
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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...
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...
2023, Biotechnology Notes Citation Excerpt : BCC53698 was found to catalyze specific elongation of the Δ6-18 carbon atom of desaturated fatty acids for polyunsaturated fatty acid biosynthesis.66 Structural and mechanistic studies of a thermostable aldolase from Acinetobacter baumannii which catalyzes aldol...
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 ...
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...
为了帮助小西西们坚定文化自信,体验学习的快乐,园西小学英语开学第一课从社交、奥运、校园、梦想职业等方面开展了综合主题活动和项目化学习。通过学习,小西西们丰富了学习经历,在体验和活动的过程中提高了实践意识和实践能力,发挥了英语学...