9.義齒熱聚式樹脂(heat-activated PMMA)的粉與液體經過混合後,在那一階段最適合置入包埋盒中進行填充 (packing)?(A)砂狀期(sandy stage)(B)絲狀期(sticky stage)(C)糰狀期(dough stage)(D)硬化期(stiff stage)