detonators造句
AnewschemeinincreasingsafetywithmethaneofpermissibleMSelectricdetonatorswasputtedforwardhosedontheexperiments,resultsoffactorsaffectingsafetywithmethane.Inmillisecondblasting,thedesignedorselecteddela...
AnewschemeinincreasingsafetywithmethaneofpermissibleMSelectricdetonatorswasputtedforwardhosedontheexperiments,resultsoffactorsaffectingsafetywithmethane.Inmillisecondblasting,thedesignedorselecteddela...