下列程序的运行结果为 #include＜iostream.h＞ template＜class TT＞ class FF {TT a1，a2，a3； public： FF(TT b1，TT b2，TT b3){a1＝b1；a2=b2；a3＝b3；} TT Sum(){return a1+a2+a3；}}； void main() { FF＜int＞x(int(1.1)，2，3)，y(int(4.2)，5，6)； cout＜＜x.Sum()＜＜‘‘＜

A．6.1 15.2

B．6 15

C．6 15.2

D．6.1 15

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