The linear and quantitative nondestructive test of the grain defect is realized by using time-frequency domain character of the ultrasonic defect signal.
利用超声缺陷信号的时频域特征，较好地实现了该类型药柱的线性定量无损检测。
The result indicate that population gene frequency variety expedite by selection and the test testify green-shell character is controled by a pair of complete dominant allele.
选择加快了群体基因频率的改变，青壳蛋性状确为由一对主效基因控制的完全显性遗传性状。
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