1、单选题:Speech organs, also called (), are those parts of human bodies involved in the production of speech.( )选项:A:speakerB:cavityC:articulatorD:producer答案: 【articulator】
2、单选题:Tra...
1、判断题:结构材料和功能材料是依据材料组成来划分的。选项:A:错B:对答案: 【错】
2、判断题:Metals in general have high electrical conductivity, high thermal conductivity, and high density.选项:A:对...