更多“超声波场区中的声压以（）上为最高，而中心轴在线的声压则随着距”相关的问题
卡夫卡揭示出人物在弱肉强食的现实世界中惶惶不可终日的困惑感的作品是（）。
A.《变形记》 B.《判决》 C.《地洞》 D.《城堡》
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一选频装置，其幅频特性在f1～f2区间急剧衰减（f2>f1），在0～f1和f2～∞之间近乎平直，这叫低通滤波器。
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Educators are seriously concerned about the high rate of dropouts among the doctor of philosophy candidates and the consequent loss of talent to a nation in need of Ph. D. s. Some have replaced the dropouts’ loss as high as 50 percent. The extent of the loss was, however, largely a matter of expert guessing. Last week a well-rounded study was published. It was based on 22 000 questionnaires sent to former graduate students who were enrolled in 24 universities and it seemed to show many past fears to be groundless. The dropouts rate was found to be 31 percent, and in most cases the dropouts, while not completing the Ph. D. requirement, went on to productive work. They are not only doing well financially, but, according to the report, are not far below the income levels of those who went on to complete their doctorates. Discussing the study last week, Dr. Tucker said the project was initiated because of the concern frequently expressed by graduate faculties and administrators that some of the individuals who dropped out of Ph. D. programs were capable of completing the requirement for the degree. Attrition at the Ph. D. level is also thought to be a waste of precious faculty time and a drain on university resources already being used to capacity. Some people expressed the opinion that the shortage of highly trained specialists and college teachers could be reduced by persuading the dropouts to return to graduate schools to complete the Ph. D.. "The results of our research," Dr. Tucker concluded, "did not support these opinions." 1. Lack of motivation was the principal reason for dropping out. 2. Most dropouts went as far in their doctoral program as was consistent with their levels of ability or their specialties. 3. Most dropouts are now engaged in work consistent with their education and motivation. Nearly 75 percent of the dropouts said there was no academic reason for their decision, but those who mentioned academic reason cited failure to pass the qualifying examination, uncompleted research and failure to pass language exams. Among the single most important personal reasons identified by dropouts for non-completion of their Ph. D. ’ s program, lack of finances was marked by 19 percent. As an indication of how well the dropouts were doing, a chart showed 2% in humanities were receiving $20 000 and more annually while none of the Ph. D. ’ s with that background reached this figure. The Ph. D.’s income in the $7 500 to $15 000 bracket with 78% at that level against 50% for the dropouts. This may also be an indication of the fact that top salaries in the academic fields, where Ph. D. s tend to rise to the highest salaries, are still lagging behind other fields. As to the possibility of getting dropouts back on campus, the outlook was glum. The main condition which would have to prevail for at least 25% of the dropouts who might consider returning to graduate school would be to guarantee that they would retain their present level of income and in some cases their present job.
A．is the most frequent reason for dropping outB．is more difficult for the science candidate than for the humanities candidateC．is an essential part of many Ph.D. programsD．does not vary in difficulty among universities
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用万用表检测一只二极管的好坏时，若测得正反向电阻均接近于零，表明该二极管（）。
A.击穿
B.烧毁
C.正常
D.断路
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一般资料：陈某，女性，23岁，未婚，中专文化求助者主诉：与人交往时紧张、局促不安已三年，羞见生人，回避社交一年余。因严重影响生活和工作而前来门诊咨询。求助者自述：某日上课，发现新来的青年男教师似乎老是...对该求助者目前的状态进行资料整理。
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新建住宅的热水集中供暖系统设计的下列要点中，哪一项是错误的（）
A.应设置分户热计量和室温控制装置B.住宅内的公共用房和公共空间，应单独设置供暖系统C.应在建筑物热力人口处设置热量表D.应计算向邻户传热因素引起的负荷，并计入热源系统的总负荷内
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某妇女的月经周期可以被描述成13（3～5/29）～30，末次月经来潮是在2002年11月29日。她的月经周期是（）。
A.3～5d
B.20～25d
C.24～27d
D.29～30d
E.30～32d
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党章是党内根本大法，是管党治党的总章程。
A . 正确
B . 错误
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下面哪些IP地址不可以在Internet上使用?
A. 127.0.0.0.1 B. 211.101.198.97 C. 172.16.29.87 D. 198.87.256.230
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断路器自动跳闸信号回路采用闪光信号装置颜色是( )。
A．黄色
B．蓝色
C．红色
D．绿色
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全服务航空公司公司拥有为数众多的合作伙伴，主要包括（）.
A.其他全服务航空公司
B.支线航空公司
C.低成本航空公司
D.航空产品分销商
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《廉政准则》规定，不准以不正当手段获取荣誉、职称、学历学位等利益。
A . 正确
B . 错误
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天安门广场呈（）。
A.十字形
B.丁字形
C.口字形
D.田字形
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当概念S与概念P有（）关系时，SEP为假而SOP为真。
A.全同
B.真包含于
C.真包含
D.交叉
E.全异
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