奈曼偏倚（Neymanbias）是指（）。
A.诊断怀疑偏倚
B.检出偏倚
C.测量偏倚
D.现患病例-新病例偏倚
E.入院率偏倚
参考答案：D
250. Jack is a very stubborn(顽固的) person. I was unable to _____ him to do as I said. I want to ask you to have a word with him.
A．let
B．make
C．prevent
D．Persuade
路基地段信号箱盒角钢基础埋深不应小于（）。
A、800mm
B、700mm
C、1000mm
D、500mm
