如果持B签证，按照移民局的规定，入境时是要看往返机票的，至于最后入境时移民官看
不看是移民官的事情，如果因为机票被遣返，航空公司要负担2000-3000美元的罚款，所
以航空公司当然有责任避免它本身受损失。看一下下面。
National：CHINA (PEOPLE'S REP.) (CN)
Destination： U.S.A. (US)
Passport required (valid for at least 6 months beyond date of
intended departure from the U.S.A.; for validity see:
For details, click here - item 2).
If holding Hong Kong (SAR China) or Macao (SAR China) passport:
passport must be valid at time of entry; passenger may be
authorized to stay up to
