The absorption of phosphorus in root, stem and leaf was enhanced under certain Cu level, but the concentration would decrease while the Cu concentration was above some level.
适量的铜有助于茶苗根、茎、叶对磷的吸收，但超过一定限度，则茶苗含磷量下降。
Screw while having dry absorption capacity, but it must be to prevent the stem turn, so as not to scratch the surface of the work.
螺杆泵虽然具有干吸能力，但是必须防止干转，以免擦伤工作表面。
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