| http://www.w3.org/ns/prov#value | - Some developers try to develop electromagnetic valve structure, but also facing some technical problems, such as the size and weight of the institutional problems, cost, reliability, and fuel consumption.But entered the 1990s as a VVT pioneer Fiat sees traditional mechanical structure VVT lack of mobility and responsiveness, the research focus to a more flexible and accurate control of electro-hyd
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