With different barrier width, barrier height, sub-well width, spacer width and n-doping concentration, the changes of DC characteristics of DBRTDs are observed and analyzed.
当势垒厚度、势垒高度、子阱厚度、间隔层厚度、掺杂浓度改变时，可以观察到DBRTD直流特性也随之改变。
The results show that fertilizing in autumn after height growth stop can help seedlings absorb N and P and increase cold resistance.
既有速生前期施肥又有秋季施肥的处理，不仅提高了苗木的生长量，而且增强了苗木的抗寒性。
How many binary trees can find that haven Node and the height of these tress are n-3?
有多少二叉树可以发现有n个节点和这些枝条的n - 3的高度吗？
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