Normal lower pole 正常下极
Normal modes in the pole and important characteristic parameters such as resonance frequency and position of the displacement node are obtained using the finite element method.
并应用有限元法对变幅杆进行了模态分析，得到了共振频率和位移节点等重要参数。
This thyroid gland is about normal in size, but there is a larger colloid cyst at the left lower pole and a smaller colloid cyst at the right lower pole.
甲状腺大小正常，但左下极可见一个大的胶样囊肿，右下极也有一小胶样囊肿。
Limit location pole was designed complementally, which played an important role in the normal work of the die and the material flow inside the workpiece.
补充设计了限位柱，对于模具的正常工作和工件内部的材料流动起到了重要的作用。
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