Research on mechanism of ecological deterioration and protection countermeasures in upper and middle Dang River;

Investigation and protection countermeasures for wild rice resources in Guiping,Guangxi;

The exploitation and utilization of germplasm resources of Chinese native fowl breeds and protection countermeasures;

Chinese sauce and salt culture and protection strategy in museum perspective——take the first Chinese sauce culture museum as an example

The main technical issues for VSC HVDC are reviewed, including converter topology, characteristics of two level and three level converters, pulse width modulation pattern, control strategy, protection strategy, switching frequency and loss reduction.

Based on the study above, some protective methods are compared, and a novel protection strategy is proposed, which is composed of BOD(break over diode) triggering thyristor valve and RC snubber circuit.

Present situation evaluation and protective countermeasure of water ecologic environment in three lakes protection area of Songhuajiang river;

So the paper tables protective countermeasures and proposals for drinking-water head site in Songhua River area.

So some urgent protective countermeasures must be taken to increase its race number.

In the light of mineral resource supply and demand situation at home and abroad and its development trend,future mineral resource protection policy of China should be in the next direction: scientific planning,adhere to the principle of "increase exploitation and reduce consumption",strict management of mineral exploration right and exploitation right,impr.

A study on characteristic of water quality and protection countermeasure in the unnatural water surface;

Study on environment protection countermeasure in Dahuofang reservoir;

Present situation and protection countermeasure of endangered zoologies species resources in northwest China;