【判断题】Website positioning refers to the target market or consumer groups of the website. ( )
【单选题】羟胺是一种碱基修饰剂,其对碱基作用的专一性很强,只作用于( )。
【单选题】期刊《Acta Numerica》是SCI-Expanded的来源期刊吗?
【判断题】For correct market positioning, it is necessary to conduct domestic market research, but it is not necessary to study foreign markets. ( )
【单选题】期刊《Acta Numerica》是SCI-E的来源期刊吗?