楼主钩的西瓜好漂亮哟，小包包也不错哦！
所有的起重机都应当有主钩的起重能力指示器和扒杆角度指示器，并且起重机司机要看得见。
All cranes will be equipped with a functional weight indicator on the main hoist and a boom Angle indicator, both visible by the operator.
通过模态分析发现，浮吊结构的振型主要表现为主钩钢丝绳-吊重系统摆动和臂架振动，振动频率都很低；
Through the modal analysis, it is found that main vibration modes of floating crane structure are swing of rope-load system and vibration of boom, and the vibration frequencies are low;
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