The productive situations of mixed middling systemis summarized,the practical experiments of usingthis system to treat tantalum&niobiumgravity concentration produced by open_circuitgrinding is also discussed.

The mixed medium sand concrete is prepared using nature ultrafine sand and machine crushed limestone sand.

Design and realization method of creative learning based on blended learning pattern;

The Practice Research for Instruction Reform of the Distance Education Curriculum Based on Blended Learning;

An Action Research on the Blended Learning in Course of Phonetics;