关于胶片特性曲线叙述错误的是
A.描绘曝光量与密度之间关系B.横坐标为密度C.由足部、直线部、肩部、反转部构成D.足部曝光不足E.产生反转是由于潜影溴化的结果
参考答案:B
80的4倍是______,______的3倍是501,7的______倍是210.
I'm feeling much better now so you ______ call the doctor. [ ]
A. couldn't
B. wouldn't
C. can't
D. needn't