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Answers to food hygiene knowledge training papers in Tianfu New District of Chengdu
10. Four years, every year.

1 1. Sexual contact transmission, blood transmission, mother-to-child transmission

12. Handshake, office supplies, * * * meals, mosquito bites.

13. HIV antibody blood test

14. More than 3 months since the last high-risk behavior.

true or false question