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高速公路上依次有A,B,C三个出口,A,B之间的距离为mkm,B,C之间的距离为...
高速公路上依次有A,B,C三个出口,A,B之间的距离为mkm,B,C之间的距离为nkm,决定在A,C之间的任意一处增设一个生活服务区,则此生活服务区设在A,B之间的概率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102205841323646/SYS201311031022058413236028_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102205841323646/SYS201311031022058413236028_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102205841323646/SYS201311031022058413236028_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102205841323646/SYS201311031022058413236028_ST/3.png)
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