【简答题】求满足下列条件的平面方程: (1)过点(1,0,2)且平行于向量a={1,-1,2}和b={2,1,0}; (2)过点(1,1,-1),(-2,-2,2)和(1,-1,2)。
【单选题】— _________________________ — I'm from China. [ ]
【单选题】听力原文:W: Mice is ill and she's in the hospital now. M: I'm sorry to hear that Q: Where's Alice now? (18)
【单选题】--Where’s my schoolbag? --______.