it's reciprocal, so USA may ask China to issue US citizens multiple entry/ year visa and travel to Tibet in exchange.
p*0
15 楼
那个应该是中文翻译还没有更新: http://beijing.usembassy-china.org.cn/niv_work.html “For most H applicants, the visa is valid for multiple entries within one year.” 好像是去年年中就改了,往来比以前是要方便多了,当然5年或者3年的visa更好,起码 应该和H1B 797表上的有效期限一致。