磨牙后三角
参考答案：位于下颌第三磨牙的后方，该三角的底朝前，为下颌第三磨牙远中面的颈缘，其尖朝向后方。
Tom showed me his new cell phone, _______ was small but it could change colors in different weather.
A．the screen of whom
B．whom the screen of
C．which the screen of
D．the screen of which
果糖胺的测定可反映糖尿病患者血糖总水平的时间是（）
A.7天
B.15～21天
C.28～35天
D.42～49天
E.56～63天
