It's a complex nonlinear programming question to find the optimization parameter in the Ordering and transporting of steel tube.

钢管订购和运输中的参数优化问题是个复杂的非线性规划问题。

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And for customers agency various special steel grade. these steel and special specifications of ordering business.

并可为客户代理各种特殊钢种、特殊规格的订货业务。

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