Study to Assess the Safety and Efficacy of ZX-7101A in Children Aged 5-11 Years With Influenza

On day1: Take two tablets of ZX-7101A orally once (specification: 10mg/ tablet) with appropriate amount of warm water

"Placebo for ZX-7101A tablet:~The appearance and properties of placebo tablets were identical to those of the trial drug ZX-7101A tablets. On Day 1, two placebo for ZX-7101A tablets were taken orally with appropriate warm water."

"Drug: Oseltamivir phosphate dry suspension:~From Day1 to Day 5 : Oseltamivir phosphate suspension was orally administered twice a day, dose according to the label."

"Drug: Placebo for Oseltamivir phosphate dry suspension:~From Day1 to Day 5 : Placebo for Oseltamivir phosphate suspension was orally administered twice a day, dose according to the label."