Program Logic Controler (PLC) is applied in control system of cement production because of its credible performance, high ration of performance to price and simple and convenient maintenance.

可编程序控制器(PLC)其性能可靠、性价比高、维护简便，在水泥生产控制中得到了广泛的应用。

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Scientific and proper ration of spares is a significant problem because the amount of spares can not only affect equipment maintenance and overhaul but also its operational readiness.

科学合理地解决备件配置问题一直为人们所瞩目，备件配置数量的多少不仅影响装备的维修甚至影响装备的战备完好率。

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Employees, Martingale notes, rejected health maintenance organizations as a way to ration care, and employers are rightfully leery of the other alternative--government rationing.

FORBES: Don't Bank On Health Savings Accounts