do we need a visa H1 stamping

We plan to land Canada as immigrant and stay there for a week. Both of my wife and I are H1 visa. Most of people said to me that we don't need new visa back the USA within 30 days. However, some people were asked a visa stamping when they came back the USA. 30 day revalidation will not work for people from a SR country. Is China a SR Country?

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