倘若卧底有线人, 此类问题尽管问. 新的公司没熟人,这种问题要谨慎.

I will ask:
-- How many members in the team? May I know the name (so from the name I can judge ....)?
-- How many years have they worked in here? (So I can know whether this is a place people stay long....)
-- How do you like the work/company so far?
-- What time you guys come to office in a day and when you leave?

....