【单选题】— How well Mary dances! I can’t believe my eyes! —_______.
【单选题】Mary always dances well, ______ her mother.
【单选题】按 Lindeman 理论,当反应物的压力或浓度由高变低时,单分子反应常表现出 : ( )
【简答题】设有向量组(Ⅰ):α 1 =(1,0,2) T ,α 2 =(1,1,3) T ,α 3 =(1,-1,a+2) T 和向量组(Ⅱ):β 1 =(1,2,a+3) T ,β 2 =(2,1,a+6) T ,β 3 =(2,1,a+4) T ,试问:当a为何值时,向量组(Ⅰ)与向量组(Ⅱ)等价?当a为何值时,向量组(Ⅰ)与向量组(Ⅱ)不等价?
【单选题】Mary dances _______ in her class.
【简答题】设有向量组(Ⅰ):α 1 =(1,0,2) T ,α 2 =(1,1,3) T ,α 3 =(1,-1,a+2) T 和向量组(Ⅱ):β 1 =(1,2,a+3) T ,β 2 =(2,1,a+6) T ,β 3 =(2,1,a+4) T ,试问:当a为何值时,向量组(Ⅰ)与(Ⅱ)等价?当a为何值时,向量组(Ⅰ)与(Ⅱ)不等价?