设随机变量X服从二项分布b（4,0.8）,Y服从泊松分布P（4），已知D(X+Y)=3.6,则X与Y的相关系数为() A.
B.
C.
D.

单项选择题340 litres of chemical X were produced in a period. There is a normal loss of 10% and an abnormal loss of 5% of the material input into the process. How many litres of material were input into the process during the period?

单项选择题A．2.2，0.4 B．2.6,0.2 C．2.4,0.6 D．2.2,0.2