对于房地产项目风险的分类，根据不同的划分原则有不同的种类。
Classification of risk for real estate projects, according to different principles of division of different types.
有几种类型的波，它们的分类是根据其中粒子的不同运动形式来划分的。
There are several types of waves, their classification being made in accordance with the motion of the individual particle.
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