select vt. 选;选择;挑选;选拔。 Her father let her select her own birthday present. 她的父亲让她自己挑选生日礼品。 vi. 挑选,选择。 adj. 1.挑选出来的;精选的;极好的。 2.〔口语〕爱挑三拣四的;挑剔的。 3.苛择的;入会条件苛刻的。 a select crew 一批精选的水手。 be select in choosing one's friends 择友谨慎。 select wines 精选的酒。 n. 1.〔口语〕精选品;顶好的货色。 2. 〔常 pl.〕被挑选者。
The system selects micro control unit and programmable logic device as the core of controller , gsm terminal module as communication device , gps as position equipment , a / d sampling for voltage and current checking , solar battery as power supply , switch dc - dc as power voltage conversion , and so on 以微处理单元与可编程逻辑器件为核心搭建系统控制器,选择gsm无线通信模块实现系统通信,全球定位系统实现水标灯定位, a d采样与转换实现电压电流检测,太阳能电池为系统供电,开关型dc - dc实现电源电压转换。
The system selects switching surface according to the approach of variable structure control . based on the control rules to design the variable structure controllers , the inner loop and the outer loop form a complete vsc control loop . the control system has switching surface and the system brings sliding along fixed desired trajectories 根据滑模变结构控制方法选择切换面,根据控制律,设计变结构控制器,使内环和外环合成为一个vsc控制器,系统的控制有切换,而且在切换面上系统将会沿着固定的轨迹产生滑动运动。