According to China's labor law, employers have the right to require employees to undergo a pre-employment physical examination, but the specific physical examination items will vary depending on the particularity of the position and the working environment.

In some cases, especially jobs in industries related to food contact, medical care, children, education, etc., you may be required to check for hepatitis B virus carrier markers. However, due to the protection of personal privacy rights, companies generally do not proactively disclose employees' hepatitis B information. Therefore, it is recommended to consult Alibaba's human resources department or check the relevant employment contracts and policies for whether a hepatitis B test is required.