QDA, which was isolated from seawater, has the ability of yielding alginate.

QDA是从海水中发现的产生褐藻多糖的细菌，无致病性。

A new approximate iterative approach, QDA method, for the steady solution of flexible mechanism is put forward, based on the finite element analysis on the distributed parameter model.

在以分布质量为模型的仃限元分析基础，上提出了一种用以求解弹性机构稳态解的新的迭代近似方法（QDA方法）。