收费的方式可以多种多样，但从经济学角度来看，用差别收费的方法可以提供较好的经济和社会的综合效益。
The method of the charge can be various, but at the Angle of economics, differential charge can provide better economic and social benefit.
在综合自动化变电站中，继电保护设备采用的通信协议多种多样，监控系统必须同时处理多种协议。
In the substation automation system, the communication protocols adopted by protection relays are varied and the SCADA has to process many protocols simultaneously. The.
机械设备液压系统的故障表现形式多种多样，而故障的产生是多种因素综合作用的结果。
The fault form in mechanical equipment hydraulic system is various, fault is the result of various factor comprehensive action.
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