首因效应又称为（）。
A、新因效应
B、晕轮效应
C、定型效应
D、先头效应
参考答案：C
This problem is said _____ three times. [ ]
A. to have been talked
B. to have discussed
C. having been discussed
D. to have been talked about
对于要进行糖原尿酸盐结晶染色的标本其乙醇固定液浓度是（）。
A.90％乙醇
B.70％乙醇
C.80％乙醇
D.75％乙醇
E.100％乙醇
