透光伐适用于郁闭度大于0.8的幼龄林,生长伐适用于郁闭度大于0.8的中龄林,抚育间伐后郁闭度不能低于0.6。
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Listen to the following passage and fill in the blanks with what you hear.[音频]What is classic?In terms of literature, a classic is a work that contains vivid characters, exciting plots, 1)_____________, imaginative fantasy, witty satire, surprising twists, unique 2)___________ not found in our real lives.Classics are 3)_________ books. Sometimes they are easy to read and sometimes they’re near impossible. Sometimes they can change you, support you, inform you and 4)_______ you.Classics are the few books 5)_______________. They are seemingly always in print or always 6)___________. The bottom line is that classics are classics because they have meaning and quality. These things seem to appeal to readers.Classics such as Moby Dick are a part of our heritage and our legacy to future 7)__________. Our world is changing so fast that we need to stop and 8)________________ our own cultural heritage. Most classics are 9)____________ _______, far beyond our ability to analyze completely.As is said by a Scottish novelist, “The difficulty of literature is not to write, but to write what you mean; not to affect your reader, but to affect him precisely 10)__________.”
1.原发性高血压的脑出血,血管破裂常发生于
A. 大脑上动脉
B. 脑基底动脉
C. 大脑下动脉
D. 大脑中动脉
E. 豆纹动脉
2.原发性高血压脑出血最常见的部位是
A. 大脑皮质
B. 侧脑室
C. 蛛网膜下腔
D. 内囊和基底核
E. 豆状核和丘脑
3.急进型高血压时,增生性小动脉硬化及坏死性细动脉炎主要发生于
A. 大脑
B. 肾
C. 心
D. 脾
E. 肾上腺