胶片未经曝光而显影加工处理后产生的密度称（）
A.乳剂灰雾
B.本底灰雾
C.片基灰雾
D.冲洗灰雾
E.照片灰雾
参考答案：B
三角形一边长为10，另两边长是方程x2-14x+48=0的两实根，则这是一个（ ）三角形。
In ____Chinese culture, marriage decisions were often made by parents for their children.
A． traditional
B． historie
C． modern
D． remote
