It adopts the digital code signal to control the gear changing and the states of the electric switch.

电子选发器采用数码信号控制换档和电子开关选通，从而克服了机械选发器的弊端。

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Electric system: Adopt PLC controller which is special used to the construction machinery. It can realize gear control, overload protection for engine, state supervision and trouble indication.

电气系统：采用工程机械专用的PLC控制器，可实现档位控制、发动机过载保护、状态监控与故障提示。

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The "Zhongli" brand electric control quick gear satellite drive construction hoisting machinery has won the state patent( the patent no. : 99 3 36200.1) ;

我公司开发研制的“重力”牌电控快速少齿差行星传动建筑卷扬机获得国家专利（专利号：99 3 36200.1）；

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Substantially more complex than previous aircraft, the new plane required the pilot to attend to the four engines, a retractable landing gear, new wing flaps, electric trim tabs that needed adjustment to maintain control at different airspeeds, and constant-speed propellers whose pitch had to be regulated with hydraulic controls, among other features.

NEWYORKER: The Checklist