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　　Principle and Progress in the Danger Area Planning of Mountain Disasters

　　山地灾害危险区区划的原理与进展。

　　Working in the place without danger of fire, exploding, acute shaking, chemistry erosion and serious dirtiness.

　　没有火灾爆炸危险，没有剧烈震动及化学腐蚀等严重污秽的场所；

　　Most of the type 1 diabetic patients with DN will die of cardio-vascular diseases in advance, the danger of whose is 20-40 times as much as those without.

　　而且大部分合并DN的1型糖尿病患者多提前死于心血管疾病，其危险性比未合并者高20～40倍。

　　In this text the danger of the weeds and the limitation of the prevention and cure method were elaborated, and the feasibility of the different variety crop suppressing weeds, the benefit and cost of their application were further analyzed.

　　通过对杂草的危害及防治方法局限性的阐述，分析了作物不同品种抑制杂草的可行性和作物不同品种干扰的效益与代价。

　　Transmission equipments are predominant parts in the communication networks. Danger of Gas with Large Specific Gravity

　　传输设备在通信网中占有较大比重.大比重气体的危害性。