International market oil price keeps running under high price level, the price margin of inferior crude oil and high-quality crude oil increases. 国际原油持续在高价位下运行,劣质原油与优质原油的价差拉大。
Cross-striated band continuous, with anterior portion lying across dorsal surface and posterior portion running along cell margin. 右区纤毛列前延至体缘并跨至背面。横纹条带整圈连续,其前部横跨背面而后部则嵌于细胞边缘。
Running large bore slow-speed diesel engines on vacuum residue is of great economical significance in saving energy and reducing transportation cost by a big margin. 试论国产减压渣油在船舶大型低速柴油机上的应用在大型低速柴油机上使用减压渣油对于节约能源、降低运输成本,具有重要的经济意义。
In order to keep electric network running safely and stably, steady-state voltage stability of the electric network computing margin, and security and stability of the electric network after the accident occurred on is very important. 为了保持电网长期安全稳定的运行,计算电网的安全稳定裕度,以及事故发生后电网的安全稳定性就显得十分重要。