单选题:根据以下材料,回答题A.PVAl7—88B.甘油C.碳酸钙D.聚乙二醇E.甘油明胶膜剂常用的成膜材料是

题目内容:
根据以下材料,回答题
A.PVAl7—88
B.甘油
C.碳酸钙
D.聚乙二醇
E.甘油明胶
膜剂常用的成膜材料是
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