简述制浆的基本概念。
参考答案:
制浆就是利用化学或机械的方法,或两者结合的方法,使植物纤维原料离解,变成本色纸浆(未漂浆)或漂白纸浆的生产过程。
基础训练篇(11)
Mrs. Wilson, the wife of a rich man, (1) some of her friends to lunch. She was trying a new way to cook fish and she was very pleased with (2) when the fish was ready. As the fish was very hot, she put it near the open window to (3) _____ for a few minutes. Five minutes later, when she came back (4) it, she was surprised to find the neighbor’s cat at the fish. She was in time to stop the cat before it was too (5). _ .That afternoon every one enjoyed the fish. They talked and laughed (6) _ four o’clock.
After the guests left, Mrs. Wilson felt tired but happy. She was sitting down in a chair near the window (7) _____ __ she saw the neighbor’s cat dead in her garden. She was sure the fish was bad. What (8) _ _ _______ happen to her friends? She at once telephoned the family doctor for help. The doctor wanted each guest (9) _____ meet him. Once again Mrs. Wilson was alone in her chair still tired (10) _ _ not longer happy. Just then the telephone rang. It was her neighbor, “Oh, Mrs. Wilson,” he cried.” My cat is dead. She was killed by someone in a car and put in your garden …”
关于体外冲击波碎石治疗下列哪一项是不对的。()
A.结石体积过大需要多次治疗
B.结石长期停留,并与周围粘连容易击碎结石
C.草酸钙结石质地硬,不易被击碎
D.治疗后一般性血尿不需要特殊处理
E.结石排出过程中可引起肾绞痛