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class除了班级,居然还有这层意思! 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。...
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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...
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...
The reactions of the alkynes [Ar(CCH)3], [Ar'(CCH)2], and ToCCH (To = 4-MeC6H4) with the appropriate amounts of PPN[Au(acac)2] (acac = acetylacetonato) allow the syntheses of the anionic complexes PPN[Au{CCAr(CCH)2}2] (9), PPN[Au{CCAr'CCH}2] (10), PPN[Au{CCTo}2...
SecTrust2 ClassReference Feedback DefinitionNamespace: Security Assembly: Xamarin.iOS.dll C# Copia [ObjCRuntime.TV(12, 0)] public class SecTrust2 : CoreFoundation.NativeObjectInheritance Object NativeObject SecTrust2 Attributes TVAttribute ...
Important Questions for CBSE Class 10 Science Chapter 6 - Life Processes 2024-25 The Excretory System in One Shot [Full Chapter] ICSE Class 10 Biology Chap 7 | Semester 2 | Vedantu Vedantu 9&10 Subscribe Share 6.7K likes 215.7K Views 2 years ago Download Notes Term 1 Marathon -CBSE 10 ...
摘要: 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 se...