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By using multi-freedom systems vibration theory, the mechanical model of wheat lodging resistance is established under the wind of wheat. On the base of this model, Wheat is regarded as a plastic material, combined with the third strength theory, the stress of section can be calculated, the result is that the considerable stress of middle of the section IV is the largest, So this cross-section is...
Sector partition is a source of segmentation associated with institution arrangements, which causes sector wage gaps. Sector wage gap in different periods show different characteristics along with the changes of ownership structure of employment, and the state-owned sector wages experienced a change from the discount to the premium, which embodies the stage characteristic of China's reform from “the...
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