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When a discussion is made on the blow-up problem for a semilinear development equation with singular cofficient,the solution is usually estimated,then the conditions for the blow-up problem are presented.

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It has high SiO2,low flux (AL2O3+2R2O),low Fe2O3,high refractoriness under load, low true density,low residual quartz,high tridymite and cristobalite.

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