Optimizing casing retrieving depth and side-tracking point by minimum cost method due to different kinds of abandoned Wells.
根据不同类型报废井，按最低成本法优选取套深度和侧斜点。
This has the side effect that the instances that those references point to can be changed inside a method and the change is seen after the method returns.
这有副作用，这些引用指向的实例可以改变在一个方法，方法返回后的变化是见过。
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