| http://www.w3.org/ns/prov#value | - Introduction DefinitionThe grain------ definition by FAO Mainly refers to wheat, coarse food grain and rice threecategories.Grain, wheat, rice and maize production account for more thantwo-thirds of total grain output.Grain mentioned in this article mainly refers to wheat, rice and maize. ?????????????????? ???????????? ???????????? 5.
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