walking support

The Examination System And The Social Mobility——On "Zijing" in Song Dynasty by Wang An—shi;

科举与社会流动性——看王安石论宋人“自进”

Research and Forecast on the Self-Evolution of the Computer Virus Based on Genetic Algorithm;

计算机病毒的遗传自进化研究预测

The counterforce size of rotaty water jet and ordinary is a key which influence the propulsion of the self-propelled water jet.

旋转射流与普通射流的反冲力的大小是影响自进式水射流系统自进力大小的关键。

Because of self-propelled water jet systems need no other power equipments, and depends upon its own water jet counterforce then can provide the power, therefore this technology has considerable potential market such as horizontal holes drilling in the coal seam, water power mining and water supply, water supply and cooling in the power plants, tank cleaning in the chemical plants and so on.

自进式水射流系统由于无需另外设置动力,依靠自身射流的反冲力便能提供动力,因而在煤矿煤层气中的水平孔的钻进、水力开采与供水、发电厂的供水与冷却、化工厂罐道的清洗等领域有着可观的潜在市场。

Application of steel pipes and automatic anchor pole in the tunnel with sandwich;

超前小钢管和自进式锚杆超前支护在泥夹石隧洞的应用