The first purpose of this paper is to study the properties on some q-shift difference differential polynomials of meromo......

分析了煤矿供电系统中由于漏电现象而导致的瓦斯爆炸原因，计算了１２７Ｖ系统单相接地电流的大小，画出了快速电装置系统的方框图，设计了解开变......