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河北省丰宁民族自治县南与北京接壤，北与内蒙古交界，丰草美得地方。由于历史上诸多因素所致，造成了植被破坏、沙化严重，继而形成了气候环境恶劣，陷入了广种薄收、越垦、越垦越穷的怪圈。为改变现状，该县提出要退耕还林，改善生态环境。近年来，县委、县政府在实践中深深感受到，丰宁要改善生态环境，必须处理好生态、生产、生活的关系。否则，让群众饿着肚子退耕改善生态就是一句空话。县里调整耕作结构，大力加大农业基础设施建设，退耕还林还草，谋求生态产业，找到了一条适合本县发展之路，实现了环境保护与发展经济相协调。上述材料体现了辩证唯物主义认识论的什么道理？
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举一反三
【判断题】In a writing, it is necessary to leave proper empty spaces at the top and bottom parts, on the left and right sides, and even between lines.
A.
正确
B.
错误
【单选题】—Guess what? Tom has failed in the exam ____ second time. —How come? He is ___ second to none in English in our class.
A.
a; a
B.
the; a
C.
a; /
D.
the; the
【简答题】电气原理图中连线和布线有哪些要求?
【单选题】He liked the article in the newspaper so much that he ______ his own work and translated it into English
A.
set out
B.
turned down
C.
cut out
D.
set aside
【单选题】--- How come your father can read books in German? --- Well, he____on a project with some German engineers for 3 years when he was young.
A.
worked
B.
was working
C.
had worked
D.
would work
【简答题】Mike lives in Zhengzhou of China. But he is from Canada. He is 12 years old this year. He speaks English. And he speaks Chinese a little. Mingming is his good friend. He is a Chinese boy. He often goe...
【简答题】读下面的 电气原理图,分析下列问题: (1)电气原理图中电动机有几种工作状态? (2)电气原理图中通过什么电器实现什么保护? (3)说明SA、SQ的作用。
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