弱逼近元在完备格中有许多重要的性质，对于刻划连续格、完全分配格起着重要的作用。
The weak approximating elements of complete lattices have a few significant properties, and play an important role in the characterizations of continuous lattices and completely distributive lattices.
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It is characterized by small volume, perfect function, reliable safety and complete separation between water and electricity, and realizes scientific management through which the users purchase and...
传统的滤波反投影算法(FBP)要求完备的投影数据，而实际检测中往往由于客观原因无法获得完全的投影数据。
Traditional filtered backprojection (FBP) method required complete projection data, which were often difficult or even impossible to acquire for objective reasons.
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