【多选题】Which of the following inventions are the inventions during the UK’ Industrial Revolution?
A.
Jenny Spinning Machine
【单选题】Many of the inventions that made people ______ and have determined the direction of American industry were related to agriculture and food production.
【判断题】在铁碳合金相图中,ES线是碳在奥氏体中的溶解度变化曲线,通常称为A1 线。
【单选题】The number of the inventions of this year is much more than ______ of last year.
【单选题】' By exchanging limited exclusive rights for ( ) of inventions and creative works, society and the patentee/copyright owner mutually benefit, and an incentive is created for inventors and authors to c...
【判断题】铁碳相图中,ES线为碳在奥氏体中的溶解度曲线,通常称为Acm线。
【单选题】恩格尔系数反映一国国民生活富裕程度。下列系数中哪个系数代表的富裕程度最高( )
【多选题】散客旅游之所以越来越受到游客的青睐,除了它的旅游形式比团队旅游灵活、伸性强,自由度大以及可客自由选择等原因外、还与以下( )因素有关。