doub
- pref./abbr.两倍；两倍的
doub-
The relationship between environmental factors ( climate and soil ) and plant life form gradient was analysed by doub sieving progressive regression method , and mathematical models were set up .
并用双重筛选逐步回归的方法分析了环境（气候和土壤）因子与植物群落生活型谱梯度的关系，建立了相应的数学模型。
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This paper gives two methods & the small triangle method and the doub - le triangle method for simulating hinge joints in order to analyse the fra - mes with hinge joints , using the simple frame program .
本文提出了两种增设杆件和刚结点来模拟铰结点的方法&小三角形法和双三角形法，以使能利用简单的平面刚架程序来计算带有铰结点的刚架。