热门试题:
[单项选择] The use of heat pumps has been held back largely by skepticism about advertisers’ claims that heat pumps can provide as many as units of thermal energy for each unit of electrical energy used, thus apparently contradicting the principle of energy conservation.
Heat pumps circulate a fluid refrigerant that cycles alternatively from its liquid phase to its vapor phase in a closed loop. The refrigerant, starting as a low-temperature, low-pressure vapor, enters compressor driven by an electric motor. The refrigerant leaves the compressor as a hot, dense vapor and flows through a heat exchanger called the condenser, which transfers heat from the refrigerant to a body of air. Now the refrigerant, as a high-pressure, cooled liquid, confronts a flow restriction which causes the pressure to drop. As the pressure falls, the refrigerant expands and partially vaporizes, becoming chilled. It then passes through a second heat exchanger, the evaporator, which transfers heat from the air to the
A. measure accurately the flow rate o{ the refrigerant mass at that point
B. compress and heat the refrigerant vapor
C. bring about the evaporation and cooling of refrigerant
D. exchange heat between the refrigerant and the air at that point
[单选题]微不足道:举足轻重
A.势均力敌:众寡悬殊
B.诚惶诚恐:坐卧不宁
C.精神抖擞:神采飞扬
D.后来居上:后发先至
[单项选择]水泵水轮机的性能主要有()。
A. 功率
B. 效率
C. 运行稳定性
D. 以上全是
[不定项选择题]通过思维人可以( )多选
A.认识事物的本质
B.认识事物的内在联系
C.认识不能直接感知的事物
D.通过已知预测未知
[单选题]†年1月1日起实施的集团《上海轨道交通电客列车上线运营联控管理办法》中规定,如值乘司机检查过程中,发现符合( )条款的列车故障,应上报通知DCC值班员,同时将列车故障信息填写入司机报单。此后,DCC值班员负责通知车辆责任主体单位或通号责任主体单位确认故障等级并及时修复故障。
A.《X号线电客列车运行、检修用车计划单》
B.《X号线电客列车运行、检修用车放行通知单》
C.《X号线库内检修车放行通知单》
D.《司机可查故障表》
[判断题]投入运行前需要确认高压电器箱中的三位置转换开关置于“运行”位,确认高压电器箱正确安装后方可投入运行。投入运行的基本原则是先弱电、后强电。( )
A.正确
B.错误
[单项选择]患者,女性,35岁,性生活后少量阴道出血。检查:见宫颈口突出1个色鲜红、易出血、质软而脆、有细蒂与宫颈相连的如黄豆样大小的组织。应考虑为
A. 宫颈糜烂
B. 宫颈息肉
C. 巴氏腺囊肿
D. 尖锐湿疣
E. 宫颈腺体囊肿
[单选题]和家亲APP不能对网关做哪一项操作( )
A.无线名称
B.无线密码
C.无线功率
D.游戏加速
[判断题]对受到处分的公安机关人民警察,应当依照有关规定延期晋升、降低或者取消警衔
A.正确
B.错误
[多项选择]爱国其实是不需要理由的,因为()
A. 国家是生养我们的地方,有我们的亲人、朋友,有我们喜爱的文化传统和民俗风情
B. 国家保护我们的安全与幸福,尊重我们的自由与权利
C. 国家给我们成长,发展的机会,让我们感到温暖、亲切,充满希望
D. 国家不断在为公民谋求福利,提升经济实力,给公民民族自豪感
[单选题]事故报告后,人员伤亡、脱轨辆数( )等情况发生变化时,应及时补报
A.处理部门
B.设备损坏
C.事故定性
D.影响列车
[单项选择]主体是总部,总部与分店只有经营上的协商和服务关系的连锁方式是( )。
A. 自由连锁
B. 特许连锁
C. 正规连锁
D. 间接连锁
[单选题]以下试验项目属于破坏性试验的是( )。
A.耐压试验
B.绝缘电阻测量
C.介质损耗测量
D.泄漏测量
[简答题]Whether or not their business will succeed______________________________(已成为他们最关心的事了).
[单项选择]若车床带有()、夹簧,应确认其调整是否合适。
A. 附件
B. 导套
C. 花盘
D. 角铁
[多项选择]二次衬砌设计基本要求()。
A. 二次衬砌的厚度确定
B. 二次衬砌受力状态分析
C. 外观要求
D. 尺寸要求
[单选题]无法穿透或非常厚的物品在x 光机下显现的图像为( )色
A.绿色或蓝色
B.橙色或黄色
C.黑色或红色
D.蓝色或灰色
[不定项选择题]A.烂苹果味
A.粪臭味
B.苦杏仁味
C.鼠尿味
D.蒜臭味
E.有机磷中毒呼吸中会带有
[单项选择]商业银行最主要的资产业务为( )。
A. 存款
B. 贷款
C. 投资
D. 中间业务
[单项选择]能够增加金属材料硬度的热处理方式是()
A. 回火
B. 淬火
C. 退火
[单项选择]列车运行,原则上以开往()方向为上行。
A. 北京
B. 北方
C. 上海
D. 东方
[单项选择]Space is a dangerous place, not only because of meteors(流星) but also (1)_____ rays from the sun and other stars. The atmosphere again (2)_____ as our protective blanket on earth. Lightgets through, and this is essential for plants to (3)_____ the food which we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air (4)_____ outer space, but enormous quantities of radiation from the sun are (5)_____ off. As soon as men leave the atmosphere they are (6)_____ to this radiation, but their space suits or the walls of their spacecraft, if they are inside, (7)_____ prevent a lot of radiation damage. (8)_____ is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have (9)_____ to think that a man can (10)_____ far more radiation than 0.@1 ram without being damaged: the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to make (11)_____ about radiation damage—a person may feel perfectly well, (12)_____ the cells of his or her sex organs may be damaged, and this will (13)_____ be discovered until the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and during the outward and return journeys, the Apollo crew (14)_____ a large amount of rems. So far; no (15)_____ amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are. going to (16)_____ when they spend weeks and months outside the (17)_____ of the atmosphere, (18)_____ in a space laboratory. Drugs might help to (19)_____ the damage done by radiation, but no really (20)_____ ones have been found so far.
A. offer
B. provide
C. make
D. obtain
[多选题]电网的无功补偿应以( )为原则,并应随负荷(或电压)变化进行调整。
A.分区
B.分层
C.就地平衡
D.补偿充电功率
[判断题]《铁路旅客运输办理细则》中规定,对乘坐卧铺的旅客,卧车列车员应及时收票换发卧铺证。()
A.正确
B.错误
[多选题]依据《电气操作导则》(Q/CSG 125008—2016)4.3规定:隔离开关及跌落式熔断器操作原则中,禁止用隔离开关( )。
A.拉开带负荷设备或带负荷线路
B.合上带负荷设备或带负荷线路
C.拉开空载主变压器
D.合上空载主变压器
[判断题]使用总人工解锁按钮和区段人工解锁按钮时,须确认所解锁的区段无机车车辆占用。
A.正确
B.错误
[单项选择]最轻微的脊髓损伤()。
A. 脊髓震荡伤
B. 脊髓挫伤出血
C. 脊髓断裂
D. 脊髓受压
E. 马尾神经损伤
[判断题]手摇式绝缘电阻表,测试电压有100-2500V,量程上限达2500MΩ,应用广泛。
A.正确
B.错误
[多选题]当验明检修的低压配电线路、设备确已无电压后,至少应采取以下措施之一防止反送电:()。
A.装设遮栏
B.所有相线和零线接地并短路
C.绝缘遮蔽
D.在断开点加锁、悬挂“禁止合闸,有人工作!”或“禁止合闸,线路有人工作!”的标示牌
[单选题]义务机构对非自然人客户受益所有人的追溯,应当逐层深入并最终明确为掌握控制权或者获取收益的自然人,对于公司的受益所有人判定标准不正确的是:(
A.直接拥有超过 25%公司股权或者表决权的自然人
B.间接拥有超过 20%公司股权或者表决权的自然人
C.通过人事、财务等其他方式对公司进行控制的自然人
D.公司的高级管理人员
[单选题] 年5月16日至18日,“21世纪初中国扶贫战略国际研讨会”在北京举行。国务院扶贫开发领导小组组长温家宝在会上说,中国农村没有解决温饱的贫困人口从1978年的2、5亿减少到1999年的(),到2000年底,中国农村贫困人口的温饱问题可以基本解决。
A.2200万
B.3400万
C.6500万
D.1800万
[多选题]站内和行人较多的地段, 设备支柱在距轨面2.5m高处均要设 标志。
A.牵引供电
B.警示
C.网电
D.提醒
[单项选择]
男性,10岁,有性早熟的临床表现,松果体区见一类圆形等T1、等T2信号灶,直径约2cm,注射Gd-DTPA后病烛明显强化,该病变最可能的诊断为()
A. 脑脓肿
B. 脑转移瘤
C. 生殖细胞瘤
D. 脑血管畸形
E. 脑膜瘤
[单选题]对于应进行入账处理的汇入款项,柜台人员需填写内部通用凭证,经柜台经理审核签章后,使用“4315不动户转正常户/销户”交易将该不动户转为正常户。核心系统自动将账户余额转回原账户,并恢复该账户从转入久悬未取专户日至交易日的积数,在()时补计存款人利息。
A.当日
B.次日
C.下一工作日
D.下一结息日