对拖船螺旋桨来说，除了应计算系桩状态的静态强度外，还应计算自由航行状态的疲劳强度。
As for a propeller of a tugboat, it is necessary to calculate the fatigue strength in the self running state as well as the static strength in the bollard state.
对拖船螺旋桨来说，除了应计算系桩状态的静态强度外，还应计算自由航行状态的疲劳强度。
As for a propeller of a tugboat, it is necessary to calculate the fatigue strength in the self running state as well as the static strength in the bollard state.
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