题目详情
题目详情:

[多项选择]在汽车空调的蒸发器中,对制冷剂的热力学要求的指标中,包括有()的项目。
A. 蒸发压力高于大气压
B. 蒸发温度应低
C. 蒸发压力应低于大气压
D. 蒸发潜热应小
E. 单位容积制冷量应大

热门试题:

[单选题]差动放大电路是为了(____)而设置的。
A.稳定Au
B.放大信号
C.抑制零点漂移
D.提高速度
[多选题]消防救援人员在行走时,不得( )。
A.边走边吸烟
B.吃东西
C.扇扇子
D.搭肩挽臂
[单项选择]有关调查问卷设计的叙述,下列哪项是正确的()。
A. 可采用诱导性询问
B. 一个问题只能问一件事
C. 合理设计问题,不必考虑排列顺序
D. 调查不需要考虑隐私问题
[名词解释]勾兑
[多项选择]下列关于中国工程咨询协会组织机构的说法,正确的有( )。
A. 会员代表大会是中国工程咨询协会的最高权力机构
B. 理事实行任期制,每届任期5年
C. 常务理事会由会长、副会长、常务理事和秘书长组成
D. 常务理事会每年召开一次
E. 协会根据工作需要设立若干专门委员会
[单选题]下列哪部作品不是高尔基自传体三部曲?(  )。
A.《童年》
B.《少年》
C.《在人间》
D.《我的大学》
[多项选择]系统分析的要素包括()。
A. 目标
B. 替代方案
C. 模型
D. 费用和效益
[不定项选择题]共用题干 Rainmaking
1 The idea of rainmaking is almost as old as man,but it was not until 1946 that man succeeded in making rain.In ancient times,rainmakers had claimed to bring rain by many methods:dancing.singing-Kiiiing animals t including humans).
2 For a long time,men have understood where rain comes from.Water from the surface of oceans and lakes becomes part of the air,where it forms clouds from which rain falls.But exactly what starts the formation of raindrops was not known until quite recently.A man named John Aitken proved that drops of water gather around tiny bits of dust or other matter.The centers of the drops are so small that the human eye cannot see them.Without such centers,it seems raindrops do not form.
3 During World War Ⅱ,Dr.Irving Langmir,and his assistant Schaefer,were hired by the General Electric Company to study how and why ice forms on the wings of airplanes.They went to a mountain in New Hampshire,where snowstorms are common and cold winds blow.They were surprised to find that often the temperature of the clouds surrounding them was far below the freezing point,and yet ice did not form in the clouds.
4 After the War,Schaefer experimented with a machine that created cold,moist air similar to the air found in clouds.To imitate the moist air of a cloud,Schaefer would breathe into the machine.Then he would drop into the freezer a bit of powder,sugar,or some other substance.For weeks and months he tried everything he could imagine.Nothing happened.No crystals of ice were formed.None of the substances would serve as the center of a snow crystal or raindrops.
5 One July morning,Schaefer was dropping in bits of various substances and watching the unsuccessful results.Finally,a friend suggested that they go to eat lunch and Schaefer went with him.As usual,he left the cover of the freezer up,since cold air sinks and would not escape from the box.
6 Returning from lunch,Schaefer found that the temperature of the freezer had risen to a point higher than that required for ice crystals to remain solid.There were two choices now.He could close the cover and wait for the freezer itself to lower the air temperature,or he could make the process occur faster by adding dry ice-a gas in solid form that is very,very cold.He chose the latter plan.As he dropped the steaming white dry ice into the freezer,he happened to breathe out a large amount of air.And there,before his eyes,it happened!He had made ice crystals,not by adding centers to the moisture,but by cooling the breath so much that the liquid had to form crystals!Then he began to blow his breath into the freezer and drop large pieces of dry ice through it to create crystals which became a tiny snowstorm falling slowly to the floor of his laboratory.
7 After planning carefully,Schaefer made an experiment by dropping dry ice from his plane to the clouds below him.As was expected,snow formed and fell from the bottom of the cloud.Schaefer succeeded.He made history. Paragraph 2______
A.Langmir and Schaefer's Work for the GE Company
B.Langmir and Schaefer's Discovery of Rain-forming
C.Men's Knowledge of Rain-forming
D.Schaefer's Several Unsuccessful Experiments
E.Schaefer's Discovery by Accident
F.Langmir and Schaefer's Successful Cooneration
[单选题]动火工作票不得代替设备停复役手续或工作票、工作任务单和事故紧急抢修单。
A.A.正确
B.B.错误
[多选题]煤矿企业常见的职业病有( )
A.尘肺
B.电光性眼炎
C.噪声聋
D.煤矿井下工人滑囊炎
E.职业中毒
[多选题]发展规划实施过程中需落实的重点任务包括()。
A.确保主要指标顺利实现
B.推动重大工程项目加快实施
C.推动重大改革政策尽快落地
D.构建空间规划体系
E.激发市场主体活力
[单项选择]物流系统的输出是()。
A. 物流情报
B. 流通加工
C. 产品配送
D. 物流服务
[单项选择]投资偏差的分析方法常用的方法不包括()。
A. ABC分析法
B. 资源负荷图法
C. 横道图法
D. 表格法
[多选题]在仓储管理中,提高仓容使用效能的主要途径有()。
A.合理规划布局,扩大仓库有效面积
B.充分利用仓库空间
C.储位调整
D.增加堆码层数
[单项选择]省、自治区、直辖市的人民代表大会代表()以上书面联名,可以提出本级人民代表大会常务委员会组成人员,人民政府领导人员,人民法院院长,人民检察院检察长的候选人。
A. 三十人
B. 二十五人
C. 二十人
D. 十人
[单选题]绿系统正常由谁增压 Which pump supplies prussure to green system in normally condition?( )
A.一个电动泵 An electric pump
B.一个发动机泵和一个电动泵 An engine drive pump and an electric pump
C.两个发动机泵 The two engine drive pump
[单选题] 组合式风阀是风量调节由多个的单个风阀组成的一个大流通面积的风阀,主要用于大通风管道;该风阀由执行器通过联杆机构带动叶片作( )范围内往复运动,达到控制气流的目的。
A.0~30°
B.0~60°
C.0~90°
D.0~120°
[简答题]经营加工木(竹)材有什么规定?
[填空题]一号线空调小系统设置模式有:0—停运,1—通风,2—()。
[单选题]下列试验属于沉淀反应的是( )
A.肥达反应
B.外裴反应
C.抗链球菌“O”试验
D.Ascoli试验
E.以上都不是
[单选题]80
A.80
B.160
C.20
D.40
[判断题]各级行及其工作人员应当为在工作中知悉的个人信用信息保密。()
A.正确
B.错误
[单项选择]一条指令必须包括
A. 操作码和地址码
B. 信息和数据
C. 时间和信息
D. 以上都不是
[单项选择]《童年》、《在人间》、《我的大学》三部小说的作者是______。( )
A. 莫泊桑
B. 高尔基
C. 托尔斯泰
D. 雨果
[单项选择]正常成年人安静时,通气/血流比值的正常值是 ( )
A. 0.48
B. 0.64
C. 0.84
D. 1.4
E. 0.58
[单选题]以下对于拒绝服务攻击描述错误的是:( )
A.通过盗取管理员账号使得管理员无法正常登录服务器
B.通过发送大量数据包导致目标网络带宽拥塞,正常请求无法通过
C.通过发送大量连接请求导致操作系统或应用的资源耗尽,无法响应用户的正常请求
D.通过发送错误的协议数据包引发系统处理错误导致系统崩溃
[单项选择]计算动态数列指标可以是()
A. 实际数
B. 平均数
C. 率
D. 构成比
E. 以上均正确
[单选题]政府主管部门事先应确保把发生事故时要采取的()和正确做法等有关资料散发给可能受事故影响的公众。
A.安全措施
B.重大隐患
C.有关事项
[多选题]三十五条)下列有关倒塌的说法正确的是( )。
A.扑救楼层火灾,楼层内积水较多时,应组织排水,必要时在确保建筑结构安全的情况下开凿孔洞进行排水,防止楼板承载过重造成坍塌。
B.扑救钢结构建筑火灾时,通常情况下不需要冷却钢梁和钢柱等承重结构,应将主要力量部署在灭火上。
C.破拆着火建筑屋顶,或采取其他排烟措施,实施排烟散热,防止建筑结构因高温强度下降倒塌。
D.根据救援需要对危险建筑结构采取加固措施,消除倒塌风险。
E.必要时对有倒塌风险的构件进行拆除,对有塌方风险的地方进行清除开挖主动排除倒塌风险。
[判断题]在屋顶及其他危险的边沿进行作业,临空面应装设安全网或防护栏杆,施工作业人员可不使用安全带。
A.正确
B.错误
[单项选择]患儿男,3岁。1年内反复肺炎3次,有反复鼻塞、流涕和(或)咳嗽、咳痰病史。如要明确该患儿是否有中性粒细胞缺陷,需进行的免疫学检查为()
A. T细胞分类
B. 淋巴细胞转化实验
C. 免疫球蛋白
D. NBT
E. HLA
[单项选择]DNA变性时紫外光吸收值达到最大值的50%时的温度称为()
A. 融解温度Tm
B. 增色效应
C. 减色效应
D. DNA复性
E. 核酸分子杂交
[填空题]本装置管网来的3.5MPa蒸汽,减温减压后转变为( )蒸汽,分别作用于( )、( )、( )。
[单选题]成釉细胞瘤属于
A.牙源性颌骨囊肿
B.发育性囊肿
C.阻塞性囊肿
D.牙源性肿瘤
E.孤立性囊肿
[单项选择]以下哪一项不属于CI手册的基本设计系统()。
A. 企业标志
B. 标准字
C. 包装
D. 标准色
[单选题]标志着北宋诗文革新运动最高成就的作家是()
A.苏轼
B.王安石
C.范仲淹
D.欧阳修

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