【简答题】Every now and then we hear news about poisonous food, such as tainted milk powder, illegal food additives, and illegal cooking oil, which pose great er to peoples health. Give your ideas of cracki...
【判断题】若事件 A 与B 相互独立,则 A 与B 互不相容
【单选题】若事件A与事件B互不相容,且P(A)=0.5, P(B) =0.2 , 则 P(A+B )=( )
【判断题】若事件A与事件B互不相容,则P(A∪B)=P(A)+P(B)。( )
【单选题】若事件A与事件B互不相容,且P(A)=0.5, P(B) =0.2 , 则 P(A-B )=( )
【简答题】SECTION A COMPOSITION (35 MIN) There are two factors for students to enter a university: school brand or major. Which do you think is more important? Write on ANSWER SHEET TWO a composition of 200 wor...
【单选题】下列各现象中不属于自然选择作用的例子的是 [ ]
A.
头发里的虱子经DDT处理后仍有突变种存活下来
【简答题】若事件A与事件B互不相容,且P(A)=0.5, P(B)=0.2 , 则 P(A-B)=____