It is obvious th at A. C. motors are superior to D. C. motors in many appli cations.

显然，交流电机在许多应用场合比直流电机优越。

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For the question evoked by the modification of the complementary norm, the article holds to the principle of appli...

由补充规范的变更引起的溯及力问题，应坚持从旧兼从轻原则。

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[GUO Xianguang. Appli-cation of improved entropy method in evaluation of economic res ult[J]. System Engineering Theory&Practice, 1998, (12):98~102. ].

[10]郭显光。改进的熵值法及其在经济效益评价中的应用[J]。系统工程理论与实践，1998，（12）：98~102。

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The metal workshops include repair units for sewing machines and bicycles, household appli-ances and electronic equipment.

UNESCO: Background