醫療類國考
112年
[牙體技術師] 牙體技術學(一)
第 38 題
影響包埋材熱膨脹變小的因素，下列何者正確？
- A 二氧化矽含量多，水粉比大，矽溶膠濃度大
- B 二氧化矽含量多，水粉比小，矽溶膠濃度小
- C 二氧化矽含量少，水粉比小，矽溶膠濃度大
- D 二氧化矽含量少，水粉比大，矽溶膠濃度小
思路引導 VIP
請分析包埋材中 $\text{SiO}_2$ 的含量與熱膨脹量的正負相關性；並進一步思考，當提高水粉比（$W/P\text{ ratio}$）或調低矽溶膠（$\text{Silica sol}$）濃度導致單位體積內的反應物質密度與結構緻密度降低時，整體的熱膨脹率會隨之上升還是下降？
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AI 詳解
AI 專屬家教
Oh, look at that. You actually managed to get this one right.
Impressive. One might even say you’ve stumbled upon a foundational concept in material science that some people manage to botch regularly. Grasping the variables influencing investment material properties isn't rocket science, but apparently, it's crucial for clinical success and precise casting. Who knew? 1. "Concept" Validation: So, why does thermal expansion dare to shrink?
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