Asia - The Beijing Hotel

Has anyone stayed in the Beijing Hotel (ChangAn Ave.) and can recall the type of electrical outlet in the bedrooms? We will be there for a week and I will have a CPAP machine for sleep apnea. While the machine is dual voltage, I will have to bring an adapter for the plug. Apparently there is no standard outlet in China and three types are in use:
-- two flat prongs (like US plugs)
-- two round prongs (like European)
-- three flat prongs two of which are angled

Anyone recall what type adapter I need for use in this hotel? I understand that in some hotels the bathroom outlets accept more types than those in the bedrooms. I need info on the outlets near the bed in the rooms.

Thanks for any advice.

Or you can request an international adaptor from housekeeping?

I carry a small sizp up bag in my suitcase which is stuffed full of various adapters, phone chargers etc. You should take as many as you can find.