This paper has given a pithy analytic Proof of "principal diameter circle"Theorem. And on the basis of the thought of the theorem. We obtain two theorem about ellipse normal.
本文对主经圆定理给出了一个简练的解析证明，并且在此定理的思想基础上，得到了椭圆上法线的两个性质定理。
The morphological qualitative parameters were the ratio of long diameter to short diameter. The two principal components contribute to 89.70% together.
第二个主成分只有长短径比，两种主成分能解释肌纤维变异量的累积比率达到了89.70％。
Therefore, stem diameter and leaf number could be considered as two principal selection indexs for breeding new varieties, evaluating yield and select.
因此，茎粗、叶片数可作为紫花苜蓿选种、育种、产草量估测和确定刈割适期的两个主要选择指标。
Therefore, stem diameter and leaf number could be considered as two principal selection indexs for breeding new varieties, evaluating yield and select.
因此，茎粗、叶片数可作为紫花苜蓿选种、育种、产草量估测和确定刈割适期的两个主要选择指标。
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