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PGD适用于特殊遗传病的筛查，如囊性纤维化和神经节苷脂病，而且PGD也可以用于性别选择。
PGD is good for screening for specific genetic disorders such as cystic fibrosis and Tay-Sachs disease, and also can be used to select gender.
首节及中间各节除砂管内装有滤砂筛，末节除管内装有磁铁。
A filter sand riddle is installed in the head desanding tube and in each desanding tube in the middle, and a magnet is installed in the end desanding tube.
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