Generally speaking, the quality of the expansion is quite good, and the price is a little higher than the general one, but there are also ranges to choose from. Don't worry too much at will.

In addition, if you want to do it, I suggest you go to Nanjing Huamei. First of all, the technology is guaranteed, and the expert is also a well-known Korean Yin Zhirong. Even better, there will be preferential activities from time to time, which will be very cheap to do.