为了提高计算机系统的可靠性，经常采用容错技术，校验技术等。
如果一个系统由3个子系统构成，在串联方案中，3个子系统全部正常工作时，系统才能正常工作。如果3个子系统的可靠性分别为R1=0.7，R2=0.8，R3=0.9，则系统的可靠性R为 (9) 。
若将子系统1、子系统2并联起来，再与子系统3串联起来，则此时当子系统1或2中有一个正常工作，且子系统3也正常工作时，整个系统即正常工作。此时整个系统的可靠性为 (10) 。
| Computer programmer Brendan Tammy
earned ￡ 55 000 a year by designing new computer games, yet he cannot find a
bank prepared to let him have a check card. Instead, he has been told to wait
another two years until he is 18. He works for a small company in Liverpool, where most young people of his age are looking for jobs. Brendan’s biggest headache is how to use his money. Though he has high payment, he cannot drive a car, or get credit cards. Brendan got his job four months ago, a year after leaving school with six Olive’ s (普通成绩) and working for a time in a computer shop. "I got the job because the people who run the company knew I had already written some programs." he said. "I suppose 55 000 pounds sounds a lot but I hope it will come to more than that this year. He spends some of his money on records and clothes, a A. he can’t be treated as an adult by the bank B. he can’t make as many games as he wishes C. he doesn’t know what to buy with the money D. he had learnt to use computers at school [判断题]接近、预告信号机及通过臂板，以显示注意信号为定位（ ）。
A.正确 B.错误 [单选题]【单选题】凡在坠落高度基准面( )m及以上的高处进行的作业,都应视作高处作业。
A.1.5 B.2 C.2.5 D.3 [单项选择]As people continue to grow and age, our body systems continue to change. At a certain point in your life your body systems will begin to weaken. Your joints may become stiff. It may become more difficult for you to see and hear. The slow change of aging causes our bodies to lose some of their ability to bounce back from disease and injury. In order to live longer, we have always tried to slow or stop this process that leads us toward the end of our lives.
Many factors contribute to your health. A well-balanced diet plays an important role. The amount and type of exercise you get is another factor. Your living environment and the amount of stress you are under is yet another. But scientists studying senescence (衰老) want to know: Why do people grow old They hope that by examining the aging process on a cellular level medical science may be able to extend the length of life. In order to live longer, ______. A. we have to try to be on a diet B. we should keep in high spirits C. we should try to do more exercise D. we should postpone the process of aging [多选题]( ) 色彩在人机工程中发挥着重要的作用,例如红色在生产、交通等方面的含义有()。
A. 停止,交通工具要求停车 B. 高度危险,如高压电、下水道口 C. 没有特别规定 D. 表示设备安全运行 [单选题]管理信息内网与电力监控系统等生产网络之间应采取（ ）。
A.单向隔离 B.逻辑隔离 C.强隔离 D.无隔离 E.略 F.略 [单选题]下列各项中描写春天景色的诗句是( )
A.明月别枝惊鹊,清风半夜鸣蝉。 B.几处早莺争暖树,谁家新燕琢春泥。 C.树木丛生,百草丰茂。 D.稻花香里说丰年,听取蛙声一片。 [多项选择]企业客户申请开通网上银行代付业务，须提交（）、网上代付业务服务协议及法人授权委托书（法定代表人办理无需提供）。
A. 代理业务申请表 B. 法定代表人有效身份证件原件 C. 法定代表人有效身份证件复印件 D. 经办人有效身份证件原件及复印件 [多选题]生产经营单位在开展危害辩识、风险评价和风险控制策划时，应注意满足下列充分性要求（ ）。
A.不仅考虑常规的活动，而且还应考虑非常规的活动 B.考虑自身员工的活动所带来的危害和风险外，还应考虑承包方、供货方包括访问者等相关方的活动 C.考虑作业场所内所有的物料、装置和设备造成的职业安全健康危害 D.职业安全健康目标要求 [判断题]区段内列车运行速度200 km/h正线接触网综合张力不应低于30KN。(1分)
A.正确 B.错误 [单项选择]菌类分析前对采样瓶灭菌是指将洗净并烘干后的1000mL磨口试剂瓶瓶口和瓶颈用牛皮纸裹好，扎紧，置于干燥箱中于( )灭菌2h。
A. 100℃±2℃ B. 120℃±2℃ C. 300℃±2℃ D. 160℃±2℃ [单选题]圬工梁拱应重点检查观测( )。
A.钢筋混凝土梁钢筋锈蚀混凝土溃碎、脱落情况 B.钢筋混凝土梁、预应力及部分预应力混凝土梁横隔板裂纹 C.钢筋混凝土梁、预应力及部分预应力混凝土梁顺主筋方向的水平裂纹 D.前三项均是 [单选题]以下哪条事件不属于带电作业（）。
A.带电更换线夹 B.带电接火 C.带电清洗电缆沟 D.带电更换跌落开关 [单项选择]A series of border incidents inevitably led the two countries to war.
A. distinctly B. unavoidably C. regularly D. actually [单项选择]女，18岁，8月前曾患右股骨急性化脓性骨髓炎，经治疗后好转，但局部有窦道形成，常有少许稀黄色脓汁流出，近1周瘘道口闭合，但出现高热，局部压痛明显，并有红肿，X线片示有死骨存留，而且包壳形成充分，应立即
A. 切开引流 B. 骨钻孔手术 C. 死骨摘除，植骨术 D. 瘘道搔刮术 E. 窦道切除，1期缝合 [单选题](____)负责组织开展电网实物资产分析评价
A.国网运检部 B.国网财务部 C.国网发策部 D.国网物资部 [多选题] 危险化学品是指()感染、放射性等危险性质,在运输、储存、生产、经营、使用和处置中,容易造成人身伤亡、财产损毁或环境污染而需要特别防护的物品。(易)
A. 有爆炸 B. 易燃 C. 毒害 D. 腐蚀 [单项选择]门脉性肝硬化形成过程中的基本病变为（）
A. 肝细胞变性、坏死，肝细胞再生和纤维组织增生 B. 肝内胆管增生、瘀胆和纤维组织增生 C. 肝内炎细胞浸润和纤维组织增生 D. 肝细胞变性、坏死和纤维组织增生 E. 肝细胞再生和纤维化 [多项选择]DRAM被用做系统内存是因为？（）
A. 高可用 B. 低成本 C. 低功耗 D. 低散热 [单选题]根据《关于国家机关工作人员病假期间生活待遇的规定》,职工病假在( )个月以内的,发给原工资。
A.2 B.3 C.6 D.12 [单选题]和谐型机车供电制式为单相交流25kV,( ) Hz。
A.50 B.60 C.70 我来回答: 提交
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