![detonators造句怎么写]( "detonators造句怎么写")
- AnewschemeinincreasingsafetywithmethaneofpermissibleMSelectricdetonatorswasputtedforwardhosedontheexperiments,resultsoffactorsaffectingsafetywithmethane.Inmillisecondblasting,thedesignedorselecteddelaytimeisalwaysdifferentfromtherealoneduetothedelaye...
- 20435
中文谷