But if a school is serious about the education, then its normal to observe teachers on occasion.
For what its worth to you.

For what it's worth to you, the Chinese generally comply with the old old adage, "do as I say, don't do as I do". You'd displease them by asking if you could observe them teaching on occasion, that's for sure! Even so, maybe you should ask them for the sake of equality of treatment and educational excellence!