Based on a theoretical analysis on competition mechanism of rapeseed and wheat,this paper elaborated the internal relationships among the influencing factors of cultivated land competition,and made a thorough analysis of the two crops\' competition relationship with field survey data and results.

However, the inhibition of tannins is non-competitive.

R&V non-competitive strategic alliance avoids learning competition by engrafting unrelated industries,eliminates opportunistic behavior through fusing private and public profit,and realizes zero cost by integrating unused resource nonlinearly by which it resolves the ultimate problem of traditional strategic alliances — competition.

The paper introduces two standards existing in the concept of the public goods which are defined by the academic circles: queries on the non-rivalness and non-excludability.

Non-rivalness and non-excludability are not natural attributes of public goods.

Based on Samuelson\'s discussion about the nature of the public goods,this paper discusses the properties of public goods successively in terms of non-rivalry,non-exclusivity,joint supply,and the logical implications of these properties.