Abstract: In recent years, with the deterioration of mineral resource endowment and the development of intelligent technologies, traditional flotation machine technology has been rapidly integrated ...

You wake up on a rainy Sunday morning, buzzing with energy. Your 14-year-old son is out playing football in the mud with his friends, so you jump in. From the window, your wife smiles and says, ...

The United Nations held a conference on the human environment in Stockholm, the capital of Sweden, in 1972. In its recommendations on the prevention and control of marine pollution, it acknowledged ...

ABSTRACT: The current classified researches on the modern service industries are mainly based on the state statistical standards and for the practical consideration. However, these researches which ...