In vitro accelerative fatigue test of expanded polytetrafluoroethylene mitral valve prothesis .

膨体聚四氟乙烯人工二尖瓣的体外加速疲劳实验。

China is in the accelerative stage of industrialization and economy and has the large demand of petroleum , while the domestic supply of petroleum is hard to upswing and can not meet the need . So we need import to sustain the development of economy .

中国正处于推进工业化进程，加快经济发展的时期，石油需求旺盛，而国内石油生产处于临界状态，无法提供充足的供应，因此我国经济发展要依赖石油进口。

China has been entering an overall accelerative transformation period by now .

中国目前已经进入全面加速转型期。

Whether we examine distances traveled , altitudes reached , or minerals mined , the same accelerative trend is obvious .

我们无论是考察旅行的距离，达到的高度，还是考察矿产的开采，这样一种加速的趋向都是显而易见的。

An accelerative particle swarm optimization for solving new frame of unit commitment problem under competitive environment .

以加速型粒子群优法作竞争环境下新型态机组排程问题。