1) density teaching material"
"密度"教材
1.
It introduces the "density teaching material" used in America, and makes comparison between American ones and that is used in China; thus can help us to develop the science education.
本文介绍了探究学习的特点 ,指出与探究学习相适应需要有与传统教材不同的教材 ,着重介绍了美国的“密度”教材的特点 ,并与中国的“密度”教材进行比较 ,有助于我们更好地开展科学教育。
2) wood density
木材密度
1.
Realization and utilization of two dimensional graph of wood density in triploid clones of Populus tomentosa\%.;
三倍体毛白杨无性系木材密度二维分布图的实现及应用
2.
93 15-year-old trees from the 31 provenances trial stand in Nanyu Forest Farm of Fujian Province were collected to deal with variations in bending properties of wood (modulus of elasticity and modulus of rupture) for exotic Loblolly Pine (Pinus teada) and their relationships to trees age, latewood percent and wood density in this paper.
树龄、晚材率和木材密度与MOE、MOR在0。
3.
Then the linear equation of log CT number and wood density was carried out.
使用计算机断层扫描技术进行原木无损检测,通过对原木树种断层 CT 值的统计,对 CT 设备在检测过程中的窗宽与窗位进行了设定,同时拟合出了木材 CT 值一密度值的线性方程,为原木缺陷的无损检测及木材密度的测定提供一种新方法。
3) material density
材料密度
1.
It is shown that the mass ratio and material density bo.
利用离散元数学模型来研究颗粒阻尼结构属性的改变对其阻尼减振特性的影响,结果表明,质量比和材料密度都对颗粒阻尼的减振特性有影响。
5) intensity teaching
密度教学
6) the difficulty of textbook
教材难度
1.
Dealing with the change of textbooks, an important issue should be considered is the difficulty of textbooks.
目前,我国黄甫全、鲍建生、史宁中等学者分别建立了相应的课程难度模型,这为对教材难度进行量的分析提供了良好的理论基础。
补充资料：非密度制约因素(见密度制约因素)
非密度制约因素(见密度制约因素)
l焦非密度制约因素见生态因素、密度制约后
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条