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【多选题】
下列关于图像拉伸的叙述，正确的是A.
图像拉伸主要用来改善图像显示的对比度
B.
图像拉伸按照波段进行，通过改变波段中单个像素值的显示范围来实现增强显示的效果
C.
图像直方图是选择拉伸方法的基本依据
D.
对于多波段图像，需要对每个波段分别拉伸后再进行彩色合成显示
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【简答题】阅读理解。 A man once said how useless it was to put advertisements in the newspaper.'Last week,' he said,'my umbrella was stolen from a London church. As it was a present, I spent twice its worth in adver...
【简答题】A man once said how useless it was to put advertisements in the newspapers.
【简答题】A man once said how useless it was to put advertisements in the newspapers. 'Last week,' said he, 'my umbrella was stolen from a London church. As it was a present, I spent twice its worth in advertis...
【简答题】A man once said how useless it was to put advertisements in the newspapers. “Last week,” said he, “my umbrella was stolen from a London church. As it was a present, I spent twice its worth in advertis...
【单选题】听力原文： A man once said how useless it was to put advertisements in the newspapers. 'Last week,' he said, 'My umbrella was stolen from a London church. As it was a present, I spent twice its worth in ad...
A.
He didn't pay enough money.
B.
His umbrella was a present.
C.
The umbrella was very good.
D.
The advertisement was not well written.
【单选题】—________ do you visit the old man? —Once a week. [ ]
A.
How soon
B.
How often
C.
How long
【单选题】A man once said how useless it was to put advertisements in the newspapers. 'Last week,' said he, 'my umbrella was stolen from a London Church. As it was a present, I spent twice its worth in advertis...
A.
A news item.
B.
A public announcement in the press, on TV, etc.
C.
One way to voice one's view.
D.
Public opinions.
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