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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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。最终答案为:classes;boxes;teaches;washes;goes;does;watches。
EP 2021-09-29 EP 8 Boyhood Boyhood EP 2021-10-13 EP 10 Boyhood Boyhood EP 2023-03-15 EP 39 Detective Academy S6 Detective Academy S6 EP 2021-10-29 EP 13 Boyhood Boyhood EP 2024-09-29 EP 7 A Journey for No.1 S3 跳进地理书的旅行 第三季 EP 2025-01-18 EP 7-1 My Little...
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...
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...
In many cost-sensitive environments class probability estimates are used by decisionmakers to evaluate the expected utility from a set of alternatives. Supervis 关键词: active learning cost-sensitive learning class probability estimation ranking supervised learning decision trees uncertainty sampling selective...
which was reduced by NaBH4 to give the Ru-H⋯HO dihydrogen bonded complex (η5-C5H4CH2OH) RuH(PPh3)2. The dihydrogen bonded complex (η5-C5H4CH2
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