Primary infection is that the first time that the host plants are exposed to and infected by a pathogen?
A: 正确
B: 错误
A: 正确
B: 错误
举一反三
- Primary infection is that the first time that the host plants are exposed to and infected by a pathogen?
- Secondary infection also refers to the second time a host becomes infected with the same pathogen? A: 正确 B: 错误
- Secondary infection also refers to the second time a host becomes infected with the same pathogen?
- The year of 2022 is the first time for Beijing to host Olympic Games.
- 中国大学MOOC: _________ period: the time between sb. being infected with a disease and the appearance of the first symptoms.