Every part of the compound ultrasonic torsional vibration horn is equivalent to a four -terminal network in this paper. Simplify the networks by multi-plying the matrices.
本文将组成复合超声扭转振动变幅杆的每一级都等效为一四端网络，应用矩阵相乘使多个网络得到简化。
Keratin, a kind of protein, exists widely in human and animal organs, including epidermis, hairs, wool, feather, hoof and horn. It is a natural compound material with good properties.
角蛋白是蛋白质的一种，广泛存在于人和动物的表皮、毛发以及动物的蹄、壳、爪、角中，是一类性能优良的天然生物复合材料。
Keratin, a kind of protein, exists widely in human and animal organs, including epidermis, hairs, wool, feather, hoof and horn. It is a natural compound material with good properties.
角蛋白是蛋白质的一种，广泛存在于人和动物的表皮、毛发以及动物的蹄、壳、爪、角中，是一类性能优良的天然生物复合材料。
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