Can northeast black bees cross with Chinese bees?

I can't. The reason is that the northeast black bee belongs to the western bee strain, and there is reproductive isolation between the northeast black bee and the Chinese bee.

On the other hand, the black bee in Northeast China is bigger than the Chinese bee, and its nest space is also bigger than that of the Chinese bee. Even if the intervention is successful, its eggs are laid in the middle hive, which inhibits the normal development of larvae and affects the normal development of bees because of the narrow space.