衰减系数
参考答案:
波振幅沿Z方向按指数规律衰减,并沿Z方向前进1/b距离时,振幅衰减为地表值的1/e倍。b为电磁波的衰减系数。(传播常数k的实数部分)。
第四部分:写作(共两节,满分35分)
第一节:短文改错(共10小题;每小题1分,满分10分)
增加:在缺词处加一个漏词符号(∧),并在此符号下面写出该加的词。
删除:把多余的词用斜线(╲)划掉
修改:在错的词下划一横线,并在该词下面写出修改后的词
One evening, Helen was preparing her examination in the basement of the house. Her parents had gone out shopping. Suddenly, he heard footsteps on the floor below. Known that she was the only person at home, she was frightened. Obviously, a thief has come in through the window that had been left opened for fresh air. Picking up her courage, Helen took a toy gun from the cupboard and went to upstairs. On her way, she shouted, “George, take the dog out.” To frightened the thief, she turned off some lights. The thief must have heard all the noises but rushed out through the window where he came in. Now, Helen felt somewhat relieved.
没有国家强制力的法律规则是“一把不燃烧的火,一缕不发亮的光”。此话出自()之口。
A、美国哲学家罗尔斯
B、德国法学家耶林
C、中国清末法学家沈家本
D、英国哲学家培根