interbedding of soft and hard rocks

slope with soft and hard rocks

Changes of hard and soft tissue

facial profile of soft and hard tissue

interface of soft and hard magnetic media

Principle of hard and soft acid and base

theory of hard and soft acids and bases

Formation of Complex Ions

Inferiority complex complex of inferiority

simulation of complex and large systems

cause of formation and development

Cause of Formation and Mechanism

Cause of Formation and Prevention

cause of formation of magma

causes of formation of crack

formation depth of rocks and ores

Mechanism of Formation and Succession

multi-grades controlling of formation and distribution on sandbodies

Plane of formation and regeneration of woods