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1·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。

2·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）。