<正> Introduced the coal and rock AE propagation rule,wave guide fixing technics onAE sensors,and AE forecasting coal and rock disaster on the scene and so on,T
<正> The constitutive equation was deduced. The results were obtained from theelastic and elastoplastical analysis of the cylinder sample applied with different
<正>In order to solve the problem of property test of large flow-rate safety, the property parameter of safety valve test system was analyzed, and a device for