盒子中有4只次品晶体管,6只正品晶体管,随机抽取1只进行测试,直到4只次品晶体管都找到为止,则第4只次品在第五次测试中被发现的概率为().
A. 1/9
B. 5/123
C. 4/87
D. 2/105
E. 3/98
查看答案
人群中血型为O,A,B,AB型的概率分别为0.46,0.40,0.11,0.03.现任选5人,则至多有1人血型为O型的概率为().
A. 0.045
B. 0.196
C. 0.201
D. 0.241
E. 0.461
源自特定市场内部的创新,即通过采取市场细分与定位策略,调整现有的产品和服务,以扩大市场,这是_______。
A. 水平营销
B. 纵向营销
C. 整合营销
D. 国际营销
This passage is mainly about______.
A. the streets and the city transportation in ancient Rome
B. the living conditions of ordinary people in ancient Rome
C. the beautiful building in ancient Rome
D. the food and daily supplies in ancient Rome
【B20】
A. them
B. theirs
C. their
D. they