1. Optimization about the structure of crane jib arm mainly focuses on gantry crane and single-arm crane presently, moreover toward the jib arm structure, the study is still underway. 因此，对拔杆式起重机臂架结构的拓扑优化进行研究和创新有着很大的必要性以及相当重要的工程实际意义。
2. Crane's lifting capacity will depend on the jib length; different jib length will have different lifting capacity at respective operating radius. 吊机的吊重能力取决于吊臂的长度；不同的吊臂长度在不同的作业半径下会有不一样的吊重能力。
3. A worker, while dismantling the lattice jib of a crawler mounted mobile crane, was crushed by the sagging jib. He was later certified dead in the hospital. 一名工人在拆卸履带式流动起重机上的猪笼吊臂时，遭下坠中的吊臂所压，送院后证实不治。
4. A worker, while dismantling the lattice jib of a crawler mounted mobile crane, was crushed by the sagging jib. He was later certified dead in the hospital. 一名工人在拆卸履带式流动起重机上的猪笼吊臂时，遭下坠中的吊臂所压，送院后证实不治。
5. The swinging door is pivoted on one side; the revolving door is pivoted in the centre. 转门的枢轴在一边；旋转门的枢轴则在中间。
