Glass ionomer cements are composed of()
A. zinc oxide powder and polycarboxylic
B. zinc oxide powder and phosphoric acid liquid
C. aluminosilicate powder and phosphoric acid liquid
D. aluminosilicate powder and polycarboxylic liquid
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磷酸锌水门汀使用时，液剂中的水分挥发将导致固化后材料强度________。
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