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发表于:2016-11-28
hollowflintglassThelenstelescope,orrefractor,wasvastlyimprovedwhenitbecamepossibletomanufacturehigh-qualitylensesmadefromflintglass....
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发表于:2023-12-28
1、Burleyflintclay2、Adding7%cordierite,7%flintclayand2%quartzsandinmatrixenabledthecastabletohavehighestthermalshockresistance....
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发表于:2017-01-04
BurleyflintclayPrehistoricmanusedflintknives.Containingorcomposedofflint.Theytippedtheirarrowswithflint.Tostrikeaflinttoproducesparkspebblesofflintusedinmasonryconstructi...