Then, this paper focuses on the combination of trailer steering mechanism of the optimal design.

接着，本文重点论述了组合挂车转向机构的优化设计。

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Through this combination of trailer steering mechanism on the study design for enterprises provide a good reference for solving practical problems of enterprises.

通过本文对组合挂车转向机构的研究，为企业设计人员提供了良好的参考依据，解决了企业的实际问题。

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"a vast number of on-road 18-wheeler tractor-trailer trucks hauling coal" in the Appalachian region of Kentucky and West Virginia could be converted to combination diesel-natural gas engines with the GFS system.

FORBES: Charles Koch

Muller , also said that "a vast number of on-road 18-wheeler tractor-trailer trucks hauling coal" in the Appalachian region of Kentucky and West Virginia could be converted to combination diesel-natural gas engines with the GFS system.

FORBES: Charles Koch