Is it possible to refuel aircraft with kerosene tax-free in China?

I'm writing from a small private jet connected to the internet via satcom. I'm currently flying over the Indian Ocean to Hainan. Can I refuel tax-free at the airport in Hainan? This is possible in many countries, but I've never been to China, so I'm asking. Or should I land in Thailand first and make…

Does it take a particularly long time to refuel long-haul jets such as the Airbus A380/350 or Boeing 777/787/747, or is there simultaneous multipoint refueling?

So through several tankers or underbody fuel nozzles at the same time? After all, the quantities refueled for long-haul flights are easily 10 times that of an Airbus A320

Does it basically depend on the development of crude oil prices whether airlines (or leasing companies) order new, more efficient commercial jets?

In the USA, for example, kerosene used to be much cheaper than in Europe, so the average age of commercial jets during the 1990s was much higher than in Europe, where, for example, McDonnell-Douglas DC-9 and MD-83 were still flying in large numbers.