however, your company may refuse to sponse your work permit if they know you are a 乙肝阳性 carrier. Remember the offer letter must have one condition: you have to successfully pass the 外国人体检.
it all depends on the company's hiring policy. What kind of 两对半 do you have? At my company, some 两对半 (+ and - combo) are OK, some are not OK.
before you take the offer, talk to the HR and they should give you an answer.