并进行了主共振、超谐波共振及组合共振的分析，从而进一步解释了激光育种中的频率现象。
Through analysis of primary resonance, superharmonic resonance and combination resonance, and therefore some frequency phenomena in laser breeding are explained.
多倍体出现率为87．5％，表明大鸭梨与苹果梨杂交组合在多倍体育种中具有特殊价值。
The ratio of polyploid produced was 87. 5 %, which has shown that crossing combination between Dayali and Pingguoli has special value in pear polyploid breeding.
杂交育种是一个很复杂的组合过程。
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