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如未按常规程序进行塑料热处理操作，结果义齿基托会出现“花基板”，且发生变形，密合度差。热凝塑料经水浴热处理，其结果是A、PMMA 发生聚合 B、平均分子量比牙托粉高 C、MMA发生聚合 D、其不含残留单体 E、MMA单体完全挥发 分析基托发生变形的原因可能是A、压力太小 B、填胶过早 C、冷却过快，开盒过早 D、升温过慢 E、升温过低 常规热处理方法是A、100℃恒温2h B、70℃恒温24h C、60℃恒温12h D、120℃恒温20min E、70℃恒温1.5h，100℃恒温1h 下列哪项因素不是产生“花基板'的原因A、升温过快，或过高 B、粉液比过多或 C、压力不足 D、填充塑料过过早 E、热处理时间过长
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