It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navy’s formerly top-secret system of underwater listening devices spanning the oceans.
Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies.
Earth scientists announced at a news conference recently that they had used the system for closely monitoring a
A. It is now partly accessible to civilian scientists.
B. It has been replaced by a more advanced system.
C. It became useless to the military after the cold war.
D. It is indispensable in protecting endangered species.
|
Electric Backpack Backpacks are convenient. They can hold your books, your lunch, and a change of clothes, leaving your hands free to do other things. Someday, if you don’t mind carrying a heavy load, your backpacks might also power your MP3 player, keep your cell phone’ running, and maybe even light your way home. Lawrence C. Rome and his colleagues from the University of Pennsylvania in Philadelphia and the Marine Biological Laboratory in Woods Hole, Mass. , have invented a backpack that makes electricity from energy produced while its wearer walks. In military actions, search-and-rescue operations, and scientific field studies, people rely increasingly on cell phones, global positioning system (GPS) receivers, night-vision g A. You will be too excited to watch the traffic. B. Enjoying electronic devices while walking may invite traffic accidents. C. It is not possible for you to get such a backpack. D. It is wise of you to have such a backpack. [单选题]HGPRT(次黄嘌呤-鸟嘌磷酸核糖转移酶)参与下列哪种反应（）
A.嘌呤核苷酸从头合成 B.嘧啶核苷酸从头合成 C.嘌呤核苷酸补救合成 D.嘧啶核苷酸补救合成 E.嘌呤核苷酸分解代谢 [多选题]关于应对山地救援中可能出现的失温症状，下面描述正确的是( )。
A. 组织指战员学习失温症状预防和急救技术 B. 行动前，制定病员远程会诊和紧急转运方案 C. 行动中，卫勤力量遂行保障 D. 行动中，携行充分的防寒保暖等物资 [单项选择]在完全竞争市场上，企业进行产量决策时的依据是( )。
A. 边际成本等于边际收益 B. 边际成本等于短期收益 C. 边际成本等于长期收益 D. 边际成本等于平均收益 [简答题]手足口病病人与正常人之间的传播是如何实现的？
[单项选择]公安政策实际上是一种( )，它与公安法制、公安专业对策、社会治安综合治理方针等，构成一个完整的公安对策体系。
A. 公安对策 B. 公安法规 C. 规章制度 D. 公安方针 [多选题]在带负荷的状况下更换跌落式熔断器，绝缘引流线和两端线夹的载容量应满足最大负荷电流的要求，更换完成后应（），（）。
A.A.先拆旁路引流线 B.B.先合上跌落式熔断器 C.C.再拆除旁路引流线 D.D.再合上跌落式熔断器 [单选题]在短时间内难以排除的少量危险化学品泄漏事故属于( )应急救援。
A.一级 B.二级 C.三级 D.四级 [单项选择]根据国家赔偿法的规定，下列哪些属于国家不予赔偿的情形( )
A. 某地政府为挽救当地一濒危倒闭的国有企业，强令另一企业与该国企订立订购合同，该企业不服，政府将其银行账户冻结 B. 税务局工作人员钱某与个体户赵某素有嫌隙，以赵某偷税为名借税务局名义没收其价值5000元财物， C. 工商局张某骑自行车上班途中与人相撞，发生争执后将人打伤 D. 狱警梁某的朋友被犯人陆某打伤，梁某指使同监犯人将陆某打伤 [单项选择]呃逆相当于西医何病（）。
A. 急性胃炎 B. 脑血管病 C. 反流性食管炎 D. 尿毒症 E. 膈肌痉挛 [判断题]《铁路旅客运输服务质量规范》（铁总运〔2016〕247号）规定：熟练使用本岗位相关设备设施，熟知本岗位业务知识和职责，掌握担当列车沿途停站和时刻，沿线长大隧道、桥梁、渡海等线路概况，以及上水、吸污、垃圾投放等作业情况。熟悉本岗位相关应急处置流程，具备应对突发事件能力。
A.正确 B.错误 [单项选择]甲、乙、丙三人的平均年龄为17岁，而甲、乙两人的平均年龄为15岁，则丙的年龄为( )。
A. 17岁 B. 20岁 C. 21岁 D. 18岁 [多选题]以下对掉下轨道的物品影响行车时的处理，描述正确的是（ ）。
A.站台岗第一时间发现后，马上按压紧急停车按钮，同时向行车值班员报告，并联系司机，安抚乘客，防止乘客跳下轨道拾物； B.如若行车值班员第一时间收到汇报，经确认后，必须马上按压 IBP 盘上的紧急停车按钮，并立 即向行车调度员汇报，通知值班站长，同时加强与现场联系，掌握现场具体情况； C.值班站长马上赶往事发现场，指挥处理，行车值班员报行车调度员同意后通知值班站长安排人员穿戴好防护用品拾回物品； D.物品拾上来后，值班站长要确认线路出清，危险消除，可恢复运营后，向行车值班员报告，行 车值班员向行车调度员汇报，经行车调度员同意后在 IBP 盘上按压紧急停车复位按钮进行恢复，紧急情况下可先操作后及时汇报行调，必要时及时通知司机。 [单选题]车轮踏面剥离长度1处大于（ ），2处（每1处均）大于30 mm。
A.10mm B.24mm C.40mm D.30mm [单选题]旅客列车机车CIR设备故障影响客车列尾装置使用时，列车维持运行至前方具备机车换挂条件的车站更换（）。
A.A、CIR设备 B.B、机车 C.C、列尾主机 D.D、列尾中继器 [判断题]使用中发生卡链情况，应将重物放下后方可检修。
A.正确 B.错误 [单项选择]______属于过渡色。
A. 黄色 B. 白色 C. 蓝色 D. 红色 我来回答: 提交
|
