We analysed the form of lateral pharyngeal wall movement of 15 cleft palate patients comparing with 10 normal persons by real time ultrasonic scanner.
作者应用超声波诊断仪，以10例发音正常人为对照，对15例腭裂患者发音时咽侧壁的运动形式进行了分析。
By means of congruent transformation in matrix, the method of transforming real quadratic form into standard form and the method of normal orthogonal basis are given in this paper.
借助矩阵的合同变换法，给出了化实二次型为标准形的方法、求标准正交基的方法，并给出了正定二次型判定定理的新证明。
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