在亩施75kg碳铵和7．5kg钾肥的基础上，施用磷肥对玉米生长有明显的作用，能较好地提高玉米的干物重及产量，在亩施0－80kg磷肥用量范围内，产......

Various steady models for interaction between heart and arterial system have been given in liter-ature,In our recent stu......