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An accidental discovery has brought seismologists(地震学家) one step closer to being able to predict earthquakes. As part of an unrelated effort to measure underground changes caused by shifts in barometric pressure (大气压力), a team of researchers found that increases in subterranean pressure (地下压力) preceded earthquakes along California’s San Andreas Fault(断层) by as much as 10 hours. If follow-up tests advance the findings, seismologists may eventually be able to provide a few hours’ notice for people to find safe places prior to quakes. Researchers used a high-tech equivalent of a stereo speaker lowered into a bore hole near Parkfield, Calif., a half-mile deep and five yards from a measuring device. For two months beginning in late 2005, researchers transmitted pulse signals three times per second, from the speaker to the measuring device, calculating travel time between the two stations. Surprised scientists learned the seismic waves slowed dramatically on only two occasions: two hours prior to a magnitude-1 temblor (地震), and a startling 10 hours before a magnitude-3 quake. The research team theorizes that the immense amount of pressure building along the fault causes small cracks within the rock during the final hours before an earthquake, increasing rock density and slowing the transmission signals. "The more cracks you have, the slower the seismic velocity," says study co-author Paul Silver, a geophysicist with the Carnegie Institution of Washington. Still unknown is whether there is any significance to the fact that the magnitude-3 quake had a much longer pre-seismic signal than the lower-magnitude quake, or whether it was simply because its magnitude was larger and its epicenter closer to the sensors. If scientists can flesh out the new findings during future earthquakes — a two-year study at the same seismically active location begins this September —it could form the basis of a vastly improved early-warning system for quakes. Current earthquake-warning systems give just a few seconds’ notice because they detect only P-waves, the fast-moving seismic waves that precede the more destructive waves released during a quake. Upgrading to a seismic stress meter, however, is still a long way off. Researchers hope to test whether the stress signals would still be detectable on a larger scale, with the two sensors spaced more than a few yards apart. Barring a major effort to drill multiple, half-mile-deep holes along fault lines, researchers would also need to develop a surface-based detection system capable of filtering out temperature swings and other "noise" that could confuse their seismic readings.
A．measuring barometric pressureB．measuring underground pressureC．studying pre-seismic signalsD．detecting seismic waves
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根据《药品不良反应报告和监测管理办法》,国家食品药品监督管理总局根据药品分析评价结果( )
A. 可以责令修改药品说明书，暂停生产、销售和使用 B. 对不良反应大的药品，可以撤消药品批准证明文件 C. 可以要求企业开展药品安全性、有效性相关研究 D. 可以暂停生产、销售和使用药品
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在酸洗时，为了减少工艺，可以将酸直接倒入锅内。
A . 正确
B . 错误
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ICU一名患者，监测CVP及ABP均低于正常，该患者可能（）
A.心功能不全
B.血容量不足
C.输液量过多
D.肺栓塞
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消防稳压泵型号：（），转速：（），功率：（），扬程：（），流量：（）。
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假定有以下程序段,则语句Print i*j的执行次数是( )。 For i=1 to 3 For j=5 to 1 Step –1 Print i*j Next j,i
A. 15 B. 16 C. 17 D. 18
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提成制老师带徒弟，公司与老师成本和利润如何分配？（）
A.三七
B.四六
C.五五
D.六四
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面向对象程序设计的基本过程是（）。
A.声明对象变量-对象变量实例化-设计类-对象B.声明对象变量-设计类-对象变量实例化-对象C.设计类-声明对象变量-对象变量实例化-对象D.声明对象变量-对象变量实例化-对象-设计类
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418.骨盆骨折早期最危险的并发症是：
A.膀胱破裂
B.尿道断裂
C.坐骨神经损伤
D.直肠损伤
E.出血性休克
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有的保温救生服前面设有一个带有弹簧开关的起吊环是为了便于直升机救助。（）
A . 正确
B . 错误
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网约车驾驶员完成继续教育后，应开具“继续教育培训合格通知书”。
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在精神分析技术中，常让病人舒适的躺着，把进入脑中的一切都讲出来方法为（）
A.梦的分析 B.生物反馈 C.系统脱敏 D.自由联想
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