线路上作业设置移动停车信号防护的程序是什么？《安规》第2.2.15条
Despite the fact that comets are probably the most numerous astronomical bodies in the solar system aside from small meteor fragments and the asteroids, they are largely a mystery. Scientists do not know exactly what comets are or where they come from. Educated guesses are the best we have in hand.
Considering the role of comets in legend and the memory of man, it is remarkable that we still know so little, relatively, about them. The most famous comet of all, Halley’s Comet ( named for the man who predicted its return), was first sighted by the Chinese in 240 B．C．, and it has returned to terrify the people of the world on a regular basis every since then. The ancient considered it an object of ill omen. By mysterious coincidence, the arrival of Halley’s Comet coincided with such events as the battle of Hastings in 1066, the Jewish revolt of 66 A．D．, and the last battle of Attila the Hun against the Romans. Nor is it the only comet to fill man with awe, but me
A. began their discovery earlier than the professionals
B. tend to be the leaders in the area of astronomy
C. have some advantages in discovering new comets
D. established some theories on how comets come into being
Most computer systems are (16) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (17) to an outsider attack by preventing.
(18) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (19) users. Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment, but also helps to prevent future attacks. These attacks are usually (20) by tools referred to as Intrusion Detection Systems.
方案 | 费用(万元) | 预计销售额(万元) | |
一 | 6 | 90 | |
二 | 7 | 140 | |
三 | 11 | 230 | |
四 | 13 |
[判断题]生产经营单位的特种作业人员必须委托专门培训机构进行安全作业培训，生产经营单位不需要对其进行安全培训。（ ）
A.正确 B.错误 [多项选择]肾型高血压按解剖学可分为（ ）
A. 肾血管性高血压 B. 肾实质性高血压 C. 肾素性高血压 D. 容量型高血压 E. 激进型高血压 [名词解释]本票
[判断题]日感是线中电流变化而产生电动势的一种现象，因此不是电磁感应现象
A.正确 B.错误 [单项选择]二级艾滋病的CD4+细胞数是（）。
A. CD4+细胞计数为0.8～1.0×109/L B. CD4+细胞计数为≥0.5×109/L C. CD4+细胞计数为0.2～0.49×l09/L D. CD4+细胞计数<0.2×109/L E. CD4+细胞计数为<1.2×109/L [填空题]制动缸活塞行程装有闸调器的单式闸瓦254×254制动缸空车位为（ ）mm，重车位为145～195mm。
[单项选择]女性，25岁，突然出现高度呼吸困难、发绀，咳粉红色泡沫样痰，血压80/50mmHg，两肺散在干、湿啰音，心率140次／分，心律绝对不整，心尖部闻及隆隆样舒张中晚期杂音，心电示心房颤动，抢救措施首选（）
A. 静脉滴注硝普钠 B. 静脉注射呋塞米 C. 静脉注射氨茶碱 D. 皮下注射吗啡 E. 静脉注射毛花苷C [填空题]{{B}}Section B{{/B}} {{B}}Passage 1{{/B}}
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