关于烟酸缺乏病，正确的是（）。
A.饮食中缺乏烟酸
B.饮食中色氨酸含量过高
C.皮炎
D.腹泻
参考答案：A, C, D
牙尖交错位（ICP）异常的表现是（）
A.上下牙广泛接触，个别不接触
B.下颌后退1mm再咬合
C.上下前牙中线不一致
D.咬合关系呈中性关系
E.除中切牙外咬合时呈一牙对两牙的咬合关系
Utility function is a commonly used technique to find out the tolerance of a project manager towards risk．Some project managers are more averse towards risk than others．All the following are different classifications of tolerance for risk EXCEPT______．
A．risk averter
B．risk seeker
C．risk mitigator
D．risk neutral
