已知 B =(2z-3y) e x +(3x-z) e y +(y-2x) e z ,则相应的 J 等于 ( ) 。 A. (-2 e x -4 e y -6 e z ) B. (2 e x +4 e y +6 e z )μ C. (2 e x +4 e y +6 e z ) D. (2 e x +4 e y +6 e z )
【简答题】Getting a Dessert. Waiter: How was your _____________? Sandra: It was great, thanks. Waiter: Would you like something for __________? Sandra: Yes, please. I’ll have a ____________ of cheesecake. Waite...
【单选题】The real problem is not the economic crisis that dominates the headlines, but a pair of intertwined long-term concerns: the shrinking work force, and money squandered on life support for______industri...