题目内容

熔炼铝合金，经常搅动铝液带来哪些危害？

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The amount offluoride released by a GIC()when intraoral pH decreases

A. increases
B. decreases
C. does not change
D. polycarboxylate cement

碱性电弧炉炼钢中，脱碳处理的目的是什么？

简述高锰钢的铸造性能？

Which of the following is not recommended under a composite()

A. zinc phosphate
B. glass ionomer
C. ZOE
D. Calcium hydroxide