Elevator system is complicated and enormous, in order to simplify the design of the control software for the elevator, a new method named stage-programming technique is used.
由于电梯是一个大型复杂设备，为了简化电梯控制程序的设计，采用级式程序设计的新方法。
Elevator system is complicated and enormous, in order to simplify the design of the control software for the elevator, a new method named stage-programming technique is used.
由于电梯是一个大型复杂设备，为了简化电梯控制程序的设计，采用级式程序设计的新方法。
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