结果是一个范例双重边缘化——当一连锁无党派独占者收费多，但获得总体收入少于单一的垄断。
The result was a textbook example of double marginalisation-when a chain of independent monopolists charges more, but receives less overall than a single monopoly.
工序之间的连锁或双重输出，PLC均能自动进行处理，并采用国际上均能理解的表达方式，既IEC标准。
The interlock between process steps or double output can be dealed with by using PLC, and it applies the expression which can be understood internationally, i. e. standard IEC.
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