C7H14: C-C-C-C-C-C-C e-c-c-e-e c-0 c-88-c-c c-e-ec-e c eece C10H22可写出75个异构体; C20H42可写出366319个异构体。 网 C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C7H14: C10H22可写出75个异构体; C20H42可写出366319个异构体