I’m very grateful to my middle school teachers, with ____ help my English is so excellent. A. whom B. them C. which D. whose
Lucky is the man who has no “skeleton in his closet”. When a man has done something in his life that he is ashamed of, that he wants to hide, he is said to have a “skeleton in his closet”. Som
已知向量 与 共线,设函数。 (Ⅰ)求函数的周期及最大值; (Ⅱ)已知锐角 △ABC 中的三个内角分别为 A、B、C,若有,边 BC=,,求 △ABC 的
反应4NH3(气)+5O2(气)4NO(气)+6H2O(气)在10L密闭容器中进行,半分钟后,水蒸气的物质的量加了0.45mol,则此反应的平均速率v(X)(反应物的消耗速率或产物的
平面α∩平面β=l,点A∈α,点B∈α,点C∈β,且Cl,又AB∩l=R(如图),过A、B、C三点确定的平面为平面ABC,则平面β∩平面ABC是( )A.直线CR B.直线
命题“,”的否定是( ) A., B., C., D.,
“同一个世界,同一个梦想”,北京奥运会主题口号一诞生,就得到了国内外的一致好评。这一口号是全世界人民对和平与繁荣的期盼,也将给世界的