问题
单项选择题
锐利度的表达式：S=(D2-D1)/H=K/H，其中K代表的是
A．锐利度
B．对比度
C．模糊值
D．光密度
E．灰雾度
答案
参考答案：B
解析：K=D2-D1，为相邻组织的密度差，为对比度。
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锐利度的表达式：S=(D2-D1)/H=K/H，其中K代表的是
A．锐利度
B．对比度
C．模糊值
D．光密度
E．灰雾度
参考答案：B
解析：K=D2-D1，为相邻组织的密度差，为对比度。
| 先阅读短文，在横线上写出各单词的正确形式，单词的第一个字母已给出。 |
| One day Harvey's wife was cleaning out a cupboard. "Look at all these umbrellas," Harvey's wife said to him. "There are eight and they all b 1 ." "I'll take them all to the umbrella shop and have them repaired," Harvey said. "They are too good to t 2 away." Harvey took the eight umbrellas to the shop and l 3 them there. The shopkeeper said, "They'll be r 4 tomorrow." That evening Harvey went home from the office by bus as he u 5 did. He sat next to an old woman. She had an umbrella on the floor between the s 6 . When the bus reached his stop, he picked up her umbrella and stood up. "Hey!" the woman said, "That umbrella b 7 to me." "I'm so sorry." Harvey said, giving it to her. "Please excuse me for taking your umbrella by m 8 ." The next day he collected the umbrellas from the umbrella shop and got on the bus. As he sat down, a v 9 behind said, "You have certainly had a s 10 day!" He turned around and saw the woman whose umbrella he had almost taken the day before. |