防火防潮，不变形。
If the flood wave was not deformed in motion, there was no internal friction loss, which is called kinematic wave.
洪水波在运动中不变形，则没有内摩阻损失，即所谓运动波。
A granite platform (Granite Flat Panel) was a long-term natural aging, organizational structure, uniform, linear expansion coefficient is extremely small, internal stress disappear, not deformed.
花岗石平台（花岗石平板）经长期天然时效，组织结构均匀，线胀系数极小，内应力完全消失，不变形。
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