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临床上延缓磷酸锌水门汀凝固速度的常用方法是粉和液放在______上进行调拌。

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If zinc phosphate cement is contaminated by moisture during setting()

A. its solubility increases
B. its hardness increases
C. its pH increases
D. its fluoride release increases

The following is a description of a glass-ionomer cement’s fluoride release pattern()

A. initial low-rate release，foilowed by long，low-rate release
B. initial high-rate release，followed by long，low-rate release
C. high．rate release throughout the GIC’s lifetime
D. polycarboxylate cement

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可锻铸铁中的团絮状石墨由下述方式获得 ()

A. 由白口铸铁经高温退火从渗碳体分解而得到
B. 直接从液体中结晶而得
C. 由灰口铸铁经锻造而得
D. 上述说法都不对

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铸造用硅砂含()越高，其耐火度越高。

A. Si02
B. MgO
C. Al2O3
D. Fe2O3

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