【单选题】A beneficial book is like a faithful friend who plays an important role in your life.
【简答题】Jennifer seems to believethat [A]the extinction of Y chromosome isinevitable. [B]Page’s research is more beautiful thanhers. [C]the“imminent demise”theory is nonsense. [D]whether Y chromosome will dis...
【简答题】给出下列线性规划的最优单纯形表,如表2.4.1所示。其中,s1,s2分别为第1、第2约束方程中的松驰变量。 max z=6x1+2x2+12x3 (1)求出最优基不变的b2的变化范围; (2)求出最优解不变的c3的变化范围; (3)在原线性规划的约束条件下,增加约束条件:x1+2x2+2x3≤12。其最优解是否变化?如变化,求出最优解。
【简答题】A book is like a garden carried in the pocket.
【单选题】The author's attitude towards the Y chromosome issue seems to be
【简答题】The author’s attitudetowards the Y chromosome issue seems to be [A]optimistic. [B]confusing. [C]panicked. [D]objective.
【单选题】Jennifer seems to believe that
A.
the extinction of Y chromosome is inevitable.
B.
Page's research is more beautiful than hers.
C.
the 'imminent demise' theory is nonsense.
D.
whether Y chromosome will disappear is uncertain.
【单选题】Buying a book is like consuming a beefsteak.
【单选题】A good book is like a good friend. You cannot keep it long.