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drive pipe 自流井(豎管)。

drive pulse

The elongation cell afterwardsstarts to split up , forms the root hair , the drive pipe and so on thedifferent structure , thereupon plant ' s root then grew maturely 伸長的細胞隨后開始分化,形成根毛、導管等不同結構,于是植物的根便發育成熟了。

Structure : by the drive pipe , the pressure - regulating valve or the attachment are composed 結構:由導管、調壓閥或接頭組成(具體要求根據臨床需要) 。