arched-head piston;arched top piston,crown-head piston是什么意思

用法例句

In this paper,we describe the research and development of the dome/slit control system for the 85cm telescope at the Xinglong Observatory,National Astronomical Observatories(NAOC) The system is based on the programmable logical controller(PLC) and Modbus protocol.

描述了兴隆观测基地85cm天文望远镜圆顶及天窗自动控制系统的研制情况,给出了基于PLC控制器及Modbus通信协议的控制原理,以及系统中执行器、传感器等各部分的实现方法。