| It sounds like a science fiction, but
researchers say it’s a scientific fact: Microscopic organisms dubbed "killer
algae" are paralyzing fish with unknown toxins and then eating away at their
flesh. {{U}}They{{/U}} might be making people sick, too. The name given to this single-cell organism, or dinoflagellate, is Pfiesteria piscimorte—{{U}}literally{{/U}}, "fish killer." It was discovered at North Carolina State University in 1988, but at the same time, few scientists believed in its existence, much less in its highly unusual predatory nature. But ongoing research has led to international acknowledgment of the phenomenon and, recently, research funding. Seemingly {{U}}prompted{{/U}} by an unknown substance secreted by fish, the aggressive creature swims into action. It sends neurotoxins into the water and air, paralyzing a fish’s nervous syste A. organisms B. fish C. toxins D. flesh [简答题]砼质量检查包括哪些内容？
[填空题]Remember the drinking f0untain,that once ubiquitous,and free,source of H2O It seems quaint now. Instead, bottled water is everywhere. It’s refreshing, calorie-free, convenient to carry around, tastier than some tap water and a lot healthier than sugary sodas. But more and more, people are questioning whether the water, and the package it comes .in, is safe, or at least safer than tap water and if the convenience is worth the environmental impact.
Evocative names and labels depicting pastoral scenes have convinced people that the liquid is the purest drink around. Yes,some bottled water comes from sparkling springs and other pristine (清新洁净) sources. But more than 25 percent of it comes from a municipal supply. The water is treated, purified and sold to us, often at a thousand-fold increase in price. Most people are surprised to learn that they’re drinking glorified tap water, but bottlers aren’t required to list the source on the label. The controversy isn’t s [填空题]并励电动机有硬机械特性，串励电动机有（）特性，负载变化时，前者转速（），后者转速变化大。
[单选题]患者女性,32岁,上腹部间歇性疼痛3年,空腹及夜间痛明显,进食后可缓解。3天前出现黑便,患者出现黑便的原因最可能是
A.肠道感染 B.胃溃疡出血 C.十二指肠溃疡出血 D.胃癌 E.应激性溃疡 [判断题]《铁路旅客运输管理规则》规定，棚车代用客车时，每吨位按0．5人计算定员。
A.正确 B.错误 [多项选择]银行保函可以解决交易中存在的如下问题（）。
A. 买方怀疑卖方的交货能力 B. 卖方怀疑买方的支付能力 C. 预付和迟付的矛盾 D. 在合约的执行过程中.因一方的违约导致另一方的损失 E. 买卖双方的资金不足 [不定项选择题]下面选项哪些是车辆走行部发生异常震动或异响的主要原因（ ）。
A.转向架牵引系统（电机、联轴节、齿轮箱等）故障 B.转向架和轨道之间产生共振 C.轮对产生擦伤或剥离导致轮对踏面尺寸异常 D.主风欠压 [单选题]( )规定了国家对矿山企业、建筑施工企业和危险化学品、烟花爆竹、民用爆破器材生产企业实行安全生产许可制度。
A.《劳动法》 B.《安全生产法》 C.《特种设备安全监察条例》 D.《安全生产许可证条例》 [多选题] 以下关于进入受限空间作业的说法正确的是( )。
A.进入受限空间作业前,应对受限空间的客观状况及作业内容进行危害识别不同的作业内容,应分别制定相应的作业程序及安全措施 B.停工大检修装置的塔、容器、油罐等受限空间,与系统之间采取了有效的隔离措施,受限空间内介质首次应经化验分析,合格后,每间隔4小时一次的分析方法可采用便携式检测仪进行检测 C.在停工检修期间,办理“进入受限空间作业许可证”后,中间施工是否中断不影响其有效期 D.在作业中如发现情况异常或感到不适和呼吸困难时,应立即向安全监护人发出信号,迅速撤离现场,严禁在有毒、窒息环境中摘下防护面罩 [简答题]何谓繁忙干线单线？
[单项选择]消除脂肪需怎样的运动形式（）
A. 微量运动，少于30分钟 B. 微量运动，超过30分钟 C. 亚极量运动，少于3分钟 D. 亚极量运动，超过30分钟 E. 极量运动，超过30分钟 [填空题]（）原则是连续式轧制工艺设计的理论基础。
[多选题]《中国电业安全工作规程热力和机械部分》（QB. 26164.1-2010）4.5.1规定:工作票实施（ ）的管理原则。
A.部门管理 B.分级管理 C.逐级负责 D.许可人负责 我来回答: 提交
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