工程机械作为一种生产资料，各个机种均不具有垄断性的市场结构，近似品、替代品层出不穷。
As a kind of productive material, every type of engineering machine has no monopoly market structure, and the approximator and replacer are emerging in endlessly.
工程机械作为一种生产资料，各个机种均不具有垄断性的市场结构，近似品、替代品层出不穷。
As a kind of productive material, every type of engineering machine has no monopoly market structure, and the approximator and replacer are emerging in endlessly.
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