Our country 's municipal resident structure, environmental protection and residents' economic conditions, decide the practical and necessary existence of bicycle traffic.
我国的城市居住结构、环境保护及居民经济条件决定了自行车交通存在的现实性和必然性。
Firstly, discussion focuses on configuration of BLDCM, and its running principles as well as necessary existence of torque ripple when current commutes.
本文首先从BLDCM的结构出发，介绍了其工作原理，并从理论上给出了BLDCM在电流换相过程中转矩脉动存在的必然性。
Firstly, discussion focuses on configuration of BLDCM, and its running principles as well as necessary existence of torque ripple when current commutes.
本文首先从BLDCM的结构出发，介绍了其工作原理，并从理论上给出了BLDCM在电流换相过程中转矩脉动存在的必然性。
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