<正> Work face 3312 of coal mining in a colliery was taken as an example in which methane data in a series of locations was analyzed.For the purpose of data ana
<正> A novel thermogravimetric analyzer system of furnace with multiple temperature controller was described,which mainly decreased the analysis cycle duration
<正> The start point of this text is the bottleneck problem of bolt supporting coal entrythat is security problem of bolt supporting roof,we divide one entry in