There must be good support for the mast, jib boom attachment, and other fittings.
必须有良好的支持桅杆，臂景气实习，及其他配件。
The conventional method to determine the loading position on the hydraulic cylinder of main and auxiliary boom of weight-lifting attachment on excavator is qualitative analysis.
挖掘机工作装置上的主、副臂液压缸最大受力位置，以往是通过定性分析确定。
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