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[单选题]下列关于色氨酸操纵子调控的叙述正确的是
A. 色氨酸存在时,仅生成前导 mRNA
B. 无色氨酸时,转录抑制
C. 是翻译水平的调控
D. 具有抗终止的作用
E. 色氨酸存在时,去阻遏

热门试题:

[单选题]物质由一种状态迅速的转变为另一种状态,并在瞬间以机械能的形式放出巨大能量的现象称为( )。
A.爆炸
B.燃烧
C.反应
D.分解
[判断题]检修情况下的配电网运行方式安排,应充分考虑安全.经济运行的原则,尽可能做到方式安排合理
A.正确
B.错误
[单选题]半固体润滑剂又称()。
A.干油或黄油
B.甘油或机油
C.机油或润滑油
D.光亮油或防锈油
[单选题]( )应对进入有毒区域的人员进行实时监测。
A.战斗员
B.安全员
C.指挥员
D.通讯员
[多选题]下列地点为1#高炉水泵房循环水供水地点的有哪些
A.热风炉、风口、渣口
B.后期喷淋
C.鼓风机
D.滤波站
[单项选择]病历书写的文字要求哪点是错误的()
A. 用中文
B. 可用通用外文缩写
C. 无正式中文译名的症状、体征疾病名称或药物名称可用外文
D. 患者述及的既往所患疾病名称和手术名称应加引号
E. 双位以上的数字一律不能使用阿拉伯数字书写
[单选题]关于职业健康安全与环境管理体系中管理评审的说法,正确的是( )。
A.管理评审是施工企业接受政府监管的一种机制
B.管理评审是施工企业最高管理者对管理体系的系统评价
C.管理评审是管理体系自我保证和自我监督的一种机制
D.管理评审是管理体系运行中执行相关法律情况进行的评价
[单项选择]Everything in today’s world is going faster and faster, and television commercials are no exception. At the start of the television age the standard commercial lasted 60 seconds, but most of today’s commercials are only half that length and many are even shorter. The 15-second commercial, introduced a few years ago as a way to cut skyrocketing advertising costs, may soon be the most common in the United States. (Our television-watching counterparts in Japan and Europe are already being treated to 7-second mini-commercials ! )
What stands behind the message that blips onto and off our television screens before we have time to get to the kitchen and hack Months of planning; hundreds of interviews with potential users of the product; hours of writing; dozens of actors, directors, and technicians; days of filming; and hundreds of thousands of dollm’s in payments to the television networks that will run the ad.
Take for example a recent commercial for a certain brand of cough drop
A. The approving tone of the selection and the author’s thinly disguised enthusiasm for television commercials raise serious questions about his or her credibility.
B. Although readers arc unable to assess the representativeness of the case study discussed in the selection, the considerable amount of factual detail presented inspires faith in ;he writer’s credibility.
C. The writer’s credibility is questionable because the selection devotes more attention to actors than to the technical personnel involved in making a commercial.
D. Although the selection provides useful information about the procedures involved in producing a television commercial, the writer’s credibility is weakened by a failure to say more about the costs.
[多项选择]下列锻压设备设有顶料装置的是()
A. 锻锤
B. 热模锻压力机
C. 螺旋压力机
D. 平锻机
[判断题] 变压器本体有油枕、吸湿器、净油器、瓦斯保护装置等安全保护设施。
A.正确
B.错误
[单项选择]Questions 57 to 61 are based on the following passage.
Earthquakes. Cyclones (龙卷风), Tsunamis (海啸). Floods. Mudslides (泥石流). Natural disasters have doubled infrequency over the last two decades. Catastrophes have also become more intense, destructive and threatening to human life. In 2008 alone, some 36 million people were suddenly displaced by these phenomena.
While that is an enormous figure. it is dwarfed by the number of people whose security and livelihoods are being steadily undermined by the longer-term consequences of climate change: droughts and unpredictable rainfall patterns, the degradation and desertification of the land, coastal erosion and salinification (盐化) .
A particularly disturbing characteristic of these developments is their potential to ignite conflicts within and between states, especially in situations where communities are competing for increasingly scarce resources such as fresh water and grazing land.
We are now c
A. Global general trends.
B. The lack of natural resources.
C. Dissatisfied emotion among people.
D. Global warming and greenhouse effect.
[单项选择]第二次世界大战后,美国推行“______”的“冷战”政策。
A. 向欧亚提供经济援助
B. 遏制共产主义
C. 出兵朝鲜
D. 全球经济一体化
[多选题] 求解复杂电路最常用的方法是():
A.支路电流法
B.欧姆定律
C.叠加定理
D.基尔霍夫定律
[多项选择]除焦系统的润滑点包括()。
A. 钢丝绳
B. 液压抱闸
C. 减速机
D. 轴承
[单项选择]同等条件下,反应温度升高催化剂活性将()。
A. 增强
B. 减弱
C. 不变
D. 先增强后减弱
[单选题]下列关于办理治安案件中传唤.口头传唤.强制传唤的表述正确的是()。
A.强制传唤,必须对被传唤人使用警绳.手铐等警械
B.对逃避人民警察口头传唤的,可强制传唤
C.传唤只能将被传唤人带至公安机关
D.对同一人的传唤只能使用一次
[单选题]在风险管理责任的划分上,()是相应投资组合风险管理的第一责任人。【单选题】
A.各部分负责人
B.董事长
C.独立监事
D.基金经理
[单选题]用户申请停电检修而影响其它用户停电,不属外部原因,在统计停电用户数时,除申请停电的用户不计外,对受其影响的其他用户必须按( )分类进行统计。
A.检修
B.施工
C.用户申请
[单项选择]

One of the functions of the () is to store the applications programs or the various secondaries. The () may have similar or dissimilar functions. The same control code received from two different, secondaries may warrant two different actions on the part of the host computer. If the system so requires, the host computer must also provide () for the centralized data and the software for database management. Data information is normally stored in auxiliary memories to which the computer has ready access. The () peripherals connected to the host computer allow for human entry and intervention. As needs change, application programs may require additions, deletions, or changes. Data link problems also arise which are () the range of the computer’s programmed capabilities. In such cases, human entry is required to make the necessary changes to resolve the existing problems.

If the system so requires, the host computer must also provide () for the centralized data and the sof
A. storage
B. data
C. range
D. link
[单项选择]一个人在思维中或者自以为是或者人云亦云都是缺乏思维的()。
A. 逻辑性
B. 独立性
C. 灵活性
D. 批判性
[多选题]()等的手柄应安装牢固,没有手柄的不准使用。
A.锉刀
B.手锯
C.木钻
D.螺丝刀
[判断题]失业率是指劳动力人口中失业人数所占的百分比,劳动力人口是指年龄在18岁以上具有劳动能力的人的全体。()
[单选题]下列选项中,属于压力管道的是( )。
A.直径120mm且压力为1.0MPa(表压,下同)的生活给水管道
B.直径450mm且压力为常压的生活排水管道
C.直径800mm且压力为100Pa的煤气管道
D.直径120mm且压力为0.2MPa的蒸汽管道
[多选题]过去五年,开放型经济新体制逐步健全, 、 、稳居世界前列。( )
A.对外贸易
B.对外投资
C.外汇储备
D.外汇支出
[判断题]FAS系统主要是采用分组交换技术。
A.正确
B.错误
[单项选择]矫形器的使用目的()
A. 主要是预防或矫正畸形,减轻疼痛,补偿功能活动,支承体重
B. 主要是防止骨折和扭伤
C. 主要是为了加强肌力训练,发展肌肉
D. 主要是用于各种手术的保护
E. 主要用于纠正足下垂
[单项选择]下列排序算法中,其时间复杂度和记录的初始排列无关的是 ( )
A. 插入排序
B. 堆排序
C. 快速排序
D. 冒泡排序
[简答题]论述影响烧结全压因素?
[多选题]常见的6米拉梯有()(易)
A.木质
B.竹质
C.铝合金材质
D.钢质
[判断题] 生产经营单位的从业人员是各项生产经营活动最直接的劳动者,有依法获得安全生产保障的权利,同时也应当依法履行安全生产方面的义务。
A.正确
B.错误
[简答题]在日常组织六熟悉训练时,如何检查湿式自动喷水系统中的水流指示器?
[单选题]主变压器复合电压闭锁过电流保护当失去交流电压时()。
A.A整套保护就不起作用
B.B仅失去低压闭锁功能
C.C失去复合电压闭锁功能
D.D保护不受影响
[单选题]下列叙述中( )可以造成直流电机过热。
A.电枢铁心绝缘损坏
B.绝缘老化
C.电枢绕组接地
D.换向器接地
[判断题]绕线式和鼠笼式两种电动机的转子构造虽然不同,但工作原理是 一致的。
A.正确
B.错误
[多选题]各类作业人员应被告知其作业现场和工作岗位()。
A.存在的危险因素
B.反事故措施
C.防范措施
D.事故紧急处理措施
E.略
F.略
[多项选择]验布包括检验面料幅宽、()等方面。
A. 疵点
B. 色差
C. 纬斜和纬弯
D. 出厂日期
E. 产品等级

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