感光材料未经曝光,直接显影后产生的密度为()
A.灰雾度
B.本底灰雾
C.最大密度
D.片基灰雾
E.乳剂灰雾
参考答案:B
We must prepare ourselves for the worst we are at a loss when meeting with difficulties .
A.after
B.before
C.as
D.since
B 组
简论“小剧场戏剧”的艺术特征。