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[单选题]在声波到达底面之前,由于声束扩散在试件侧面可能导致( )。
A.多次底面反射
B.多次界面反射
C.波形的转换
D.入射声能的损失

热门试题:

[单选题]可以治疗虚寒气滞,久泻不止的药物是
A.芡实
B.赤石脂
C.莲子
D.浮小麦
E.肉豆蔻
[判断题](61287)( )电磁调速异步电动机可采用改变励磁电流的方法进行调速,得到的是一组特性较硬的机械特性曲线。( )(2.0分)
A.正确
B.错误
[单项选择] Premature Smoking: A Serious Problem The third report on smoking and health from the Royal College of Physicians, which was published this month, contains important new sections on the smoking habits of children and the possible effect, on their future health. These include a twenty fold in the increase in the risk of lung cancer in heavy smokers and an increase of about three and a half times in the risk of dying from coronary(冠状的) heart disease; chronic(慢性的) oronchitis (支气管炎) and emphysema(肺气肿) are also much commoner. Teachers play an important part in determining the attitude of children to smoking, whether or not the children start to smoke, and in providing knowledge about the consequences of smoking. Whenever I see children of school age openly smoking in public, I wonder whether they really understand what they are doing. Probably most do not. I at least know that my clinical practice in lung disease will not be short of patients for the res
A. Children should not be allowed to smoke in school.
B. Their teacher should be forbidden to smoke.
C. See that the children never start smoking.
D. Children who smoke should be severely punished.
[单选题]发动机火警测试按钮检查的是什么?
A.只有 A、B 探测环路和FDU
B. A、B 探测环路和FDU和爆炸帽线路和灭火瓶压力
C. A、B 探测环路和FDU、指示和警告
D. A、B 探测环路和FDU、指示和警告和爆炸帽线路
[多选题]在U31上创建网元时,以下哪些属性若填写错误,在网元创建成功后还可以修改?
A.设备类型
B.设备硬件版本
C.网元名称
D.网元IP
[多选题]优化市场供求结构,优化存量资源配置,扩大优质增量供给,需要坚持
A.去产能
B.去库存
C.去杠杆
D.降成本
E.补短板
[单项选择]关于CR系统的构成,错误的是()
A. 射线发生装置
B. 影像读取装置
C. 控制台
D. 后处理工作站
E. 存储装置
[判断题]战国时秦国在简公七年(公元前408年),颁布“初租禾”,确认土地公有的合法性,这是秦国最早的封建性法令。
[单项选择]征收其他土地的土地补偿费和安置补助费标准,由( )规定。
A. 省级人民政府
B. 市级人民政府
C. 国务院
D. 省国土资源管理部门
[简答题]农民专业合作社向原登记机关申请变更登记。应当提交哪些文件?
[填空题]本厂输煤、脱硫、除灰电气厂用电系统分为________厂用电系统和________厂用电系统。
[名词解释]双轨制
[判断题]未取得药品批准证明文件的国外药品可以先进口,待获得批准证明文件后再进行销售。( )
A.正确
B.错误
[填空题]{{B}}PART FIVE{{/B}}
{{B}} · Read the following text.
· For each question 31—40, write one word.{{/B}}
Dear Ms. Reyes,
Our company is once again considering a location{{U}} (31) {{/U}}Well Tip’s annual March conference. For the past five years, we have held our conference{{U}} (32) {{/U}}downtown Seattle, {{U}} (33) {{/U}}this year we would like to provide our participants{{U}} (34) {{/U}}a completely different experience. We believe that Scottsdale’s relaxed atmosphere, scenic beauty, and warm climate will provide just that and also allow our guests and employees to enjoy such activities as golf, tennis, and horseback riding.

Of course, our conference isn’t all fun and games. Seminars will be held from 7 a.m. to 2 p.m. every day. We need at least six conference rooms, all equipped{{U}} (35) {{/U}}computers, a fax machine, and a copy machine. We also need banquet facilities for two occasions{{U}} (36) {{/U}}150 guests. H
[多项选择]实施冲击疗法时如果出现()时,均应停止治疗。
A. 咨询师认为必须停止
B. 求助者家属执意要求停止
C. 求助者晕厥或休克
D. 求助者出现强烈回避行为
[简答题]整流器采用温度继电器作为附加保护,当 温度超过80℃或___散热器温度超过140℃时,温度继电器触点闭合,接通报警回路。
[填空题]人体触电,按照人体接触带电体的方式分为一相触电、两相触电和()触电三种情况。
[判断题]从智能咨询总体发展情况看,目前智能机器人暂时无法完全替代人工,所以需要秉承智能与人工相结合的理念,根据智能咨询成效,不断动态调整智能和人工结合比例。
A.正确
B.错误
[多选题]以下属于Excel2010中数字分类的是( )。
A.常规
B.货币
C.文本
D.条形码
[判断题]耳缘静脉注射时,应尽量选粗的静脉处进针。 ( )
A.正确
B.错误
[多项选择]关于个人消费贷款期限说法正确的是()。
A. 抵押方式贷款期限最长不超过5年
B. 抵押方式贷款期限最长不超过10年
C. 一般客户信用方式和保证方式贷款期限最长不超过2年
D. 特定优质客户群体信用方式和保证方式贷款期限最长不超过3年
E. 特定优质客户群体信用方式和保证方式贷款期限最长不超过5年
[判断题] 若飞行器已变形、人员被困时,组织人员直接对机体进行破拆,疏散和救助被困人员。( )
A.正确
B.错误
[单项选择]

Millions of dollars often depend on the choice of which commercial to use in launching a new product. So you show the commercials to a (1) of typical consumers and ask their opinion. The answers you get can sometimes lead you into a big (2) . Respondents may lie just to be polite.
Now some companies and major advertising (3) have been hiring voice detectives who test your normal voice and then record you on tape (4) commenting on a product. A computer analyzes the degree and direction of change (5) normal. One kind of divergence of pitch means the subject (6) Another kind means he was really enthusiastic. In a testing of two commercials (7) children, they were. vocally, about equally (8) of both. but the computer reported their emotional (9) in the two was totally different.
Most major commercials are sent for testing to theaters (10) with various electronic measuring devices. People regarded as
A. fed
B. supplied
C. provided
D. equipped

[单选题] 重性精神病人特殊时期一级管控要求,在国家级各类活动安保期间,提前( )启动安保管控机制,对肇事肇祸和轻微滋事精神病人每日双见面写实,实时掌握动态;对其他及住院治疗的重性精神病人每周走访写实一次
A. 一天
B. 三天
C. 一周
D. 一个月
[判断题]5S标准的建立由区域负责人独自确定和编制就可以了。
A.正确
B.错误
[填空题] Noise constitutes a real and present danger to people’’s health. Day and night, at home, at work, and at play, noise can produce serious 【B1】 and psychological stress. No one is 【B2】 to this stress. Though we seem to 【B3】 to noise by ignoring it, the ear, in fact, never closes and the body still 【B4】 — sometimes with extreme tension — to a strange sound in the night. The 【B5】 we feel when faced with noise is the most common outward 【B6】 of the stress building up inside us. The more 【B7】 and more serious health hazards 【B8】 with the stress caused by noise traditionally have been given much 【B9】 attention. 【B10】 . when we are annoyed or made irritable by noise, we should consider these symptoms fair warning 【B11】 other things may be happening to us, some of which may be damaging to our health. 【B12】 many health hazards of noise, hearing loss is the most clearly 【B13】 and measurable by health professionals. The other hazards are harder to 【B14】 . For many of us, there may b
A. A.vulnerability
B.reactions
C.exposure
D.worries

[单选题]凡用于电气连接的所有零件应进行短路电热循环试验,短路冲击次数为( )。
A.2次
B.4次
C.3次
D.6次
[判断题]氧气瓶与乙炔瓶同车运输要卧放并采取防滚动措施。()
A.正确
B.错误
[单项选择]下列化合物中,酸性最强的是()。
A. Ge(OH)2
B. Ge(OH)4
C. Pb(OH)2
D. Pb(OH)4
[单选题]CRH380B型动车组每个牵引单元的主CCU负责内的车辆控制。
A.后列牵引单元
B.全列控制单元
C.本牵引单元
D.前列牵引单元
[填空题]某二叉树中度为2的结点有18个,则该二叉树中有______个叶子结点。
[单项选择]魏征《谏太宗十思疏》提醒君王,能否使国家长治久安,关键在于()
A. 实行法治
B. 整饬军队
C. 取得人心
D. 整顿吏治
[判断题]《人安标》中,旅客行李、物品掉下高站台时,应通知列车长或安全员使用专用工具取出,严禁跳下站台。
A.正确
B.错误
[单项选择]有关硬膜下血肿,下列哪项描述不恰当
A. 急性硬膜下血肿是脑挫裂伤皮质小动脉破裂出血引起
B. 慢性硬膜下血肿首选钻孔引流术
C. 慢性硬膜下血肿常见出血血管是桥静脉
D. 慢性硬膜下血肿癫痫发生率可达40%
E. 亚急性硬膜下血肿的时间是指伤后3天~2周
[判断题]物体的真实大小就以图样上所注的尺寸数值为依据,与图形的大小与准确性无关。(中)( )
A.正确
B.错误

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