double elevator

基本解释

The operating principle, system structure, I/O points setting and control programming approach of the PC of AC double-speed elevator are introduced.
论述了交流双速电梯PC（可编程序控制器）控制系统的工作原理、系统结构、I/O点设定以及控制程序设计方法。
General before entering the elevator shaft work, they will give the elevator do double insurance, one is at the top of the car's insurance fixed plus a steel rope;
一般他们在进入电梯井工作前，会给电梯做双保险：一是在电梯厢的顶端再加一条钢绳进行保险固定；
For the centennial restoration, the current Liberty Elevator Corp. , then a division of National Elevator, was awarded the contract to install a large, double-decker hydraulic elevator in the statue.
为了百年纪念修复，现在的自由电梯公司，当时属于国家电梯，被授予合同，在神像内安装一部大型的双层液压电梯。