cargo crane造句

• Abstract : this paper introduces the unavoidable disadvantages of the the marine cargo crane ' s relay - contactor control system and the utilizing of the programmable logic controller （ plc ） and frequency conversion control technology for the marine cargo crane , and describes the main features of the marine cargo crane ' s frequency conversion control system with programmable logic controller such as energy economization and reliable protection
  文摘:介绍了传统的船用起货机继电器?接触器控制系统及其存在的问题和可编程控器及交流变频控制技术在船用起货机上的应用，描述船用起货机plc变频控制系统的主要特性，如节能和可靠性保护。