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题目：
单选题
A临床牙冠长，倒凹大者，邻面冠边缘应止于龈缘
B上前牙切斜面由舌侧斜向唇侧
C在切端斜面舌1/3处，做一顶角90°的沟
D舌轴壁的倒凹不必消除，可以舌隆突为界分两段预备
E邻沟与邻面的线角清晰，有棱角
答案：
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其他异氰脲酸氯化衍生物
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