【单选题】【消耗次数：1】
外观为无色至淡黄色的澄清油状液体是
①
咖啡因
②
茶碱
③
尼可刹米
④
可可豆碱
参考答案：
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相关题目
【单选题】
釉质呈淡黄色的原因是（）
①
釉质钙化不良
②
釉质本身的颜色
③
釉质缺损，露出牙本质的颜色
④
釉质钙化程度高，不能透过牙本质颜色
⑤
釉质钙化程度高，透过牙本质颜色
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