1.
Discussion on “Double-Track” System in Enterprises;
关于实行企业职务管理、技术“双梯制”的探讨
2.
Application of Dual-Ladder Mechanism to Institutes of Higher Education;
高校“双梯阶”机制模型设计与应用
3.
Application of PLC on Two Elevators in Parallel Control System;
PLC在双电梯并联控制系统中的应用
4.
Application of the Single Chip Microcomputer in the Control of the Alternating Current Double Speed Elevator;
单片机在交流双速电梯控制中的应用
5.
Imagination of constructing correctly two steps mechanism in colleges and universities;
正确构建高等学校双梯阶机制的设想
6.
Nanda Automation NA200PLC Pride in the Two-Speed Elevator Control Application
南大傲拓NA200PLC在双速电梯控制中的应用
7.
Research on Control System of Linear Induction Motor Bi-side Driving Elevator;
直线感应电机双边驱动电梯的控制系统研究
8.
Design of dual-serial port elevator remote control system Based on C8051F340
基于C8051F340双串口电梯远程控制的系统设计
9.
Features and Problems of Academic Promotion System for College-based personnel: a perspective of "dual-ladders" theory;
高校专业人员职务晋升机制:特征及问题——从双梯阶机制理论的视角
10.
Study on Joint Control System of Double Elevator Based on PLC and Configuration Software;
基于可编程序控制器和组态软件的双电梯联动监控系统的研究
11.
bunk bed with ladder and guard rail
带床梯及护拦的双层床
12.
a two-way switch,eg at the top and bottom of a staircase
双路开关（如楼梯上下两端的）.
13.
A double trapezoidal specimen will generate shear debonding.
双梯形的试样将产生切变脱胶现象。
14.
“Double Ascension” in Area Plaza,in downtown Los Angeles,calif,USA.1973
洛杉矶“双重上升”阶梯形雕塑,美国
15.
Double-helix staircases link all three levels.
双螺旋楼梯将上下三层连接了起来。
16.
A Study of Temperature Gradient in Liquid Phase for Double-zone Heat Directional Solidification
双区加热定向凝固液相温度梯度研究
17.
Study of the Laddered Approach of Bilingual Teaching Mode;
“阶梯式”双语教学模式的研究与探索
18.
PLC Based Design of the Double Constant-speed Elevator Model System
基于PLC的双匀速电梯模型系统设计