doub助记

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。

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。

Unpollinated ovary in vitro culture ways and pollen irradiation induced gynogenesis pathway can induce melon haploid plants. Homozygous double haploids will be obtained via chromosome doubling rapidly.

通过未授粉子房离体培养途径和辐射花粉授粉诱导雌核发育途径诱导甜瓜单倍体植株，再经染色体加倍迅速获得纯合的双单倍体植株（Double Haploid）。