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Catheter
- Dec 11, 2018 -

The term cell biology refers to the long-distance transport system of water and inorganic salts composed of columnar cells in the xylem of vascular plants. The secondary wall thickness is unevenly thickened, and the end wall is perforated or completely dissolved, thereby forming a longitudinal continuous channel. At the same time, it can also refer to industrial conduits and oil drilling conduits.