jib boom crane是什么意思

用法例句

In view of the strong labor intensity,low efficiency and plentiful insecurity factors during the installation and dismantlement of hydraulic support, a special dismounting crane is designed.

针对液压支架在井下安装和拆除作业中存在的劳动强度大,生产效率低,不安全因素多的现实,研制出专用拆装吊车。