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[单项选择]欲配制pH=10.0缓冲溶液应选用的一对物质是()。
A. HAc(Ka=1.8×10-5)-NaAc
B. HAc-NH4Ac
C. NH3·H2O(Kb=1.8×10-5)-NH4Cl
D. KH2PO4-Na2HPO4

热门试题:

[多选题]引起术后伤口裂开的原因有
A.病人营养不良
B.术后腹压升高
C.手术技术缺陷
D.手术切口过长
[填空题]有战车之称的是哪国足球队()
[判断题]一个作业负责人同一时间最多可以使用两张作业票。()
A.正确
B.错误
[判断题]事故发生后,事故现场有关人员应当立即向本单位负责人报告,单位负责人接到报告后,应当在两小时内向事故发生地县级以上人民政府安全生产监督管理部门和负有安全生产监督管理职责的有关部门报告。
A.正确
B.错误
[判断题]已经退休的消防救援人员退休前或者退休后有违法违纪行为的,不再给予处分。(  )
A.正确
B.错误
[单选题]管线代号中H代表()
A.保温
B.蒸汽伴热
C.电伴热
D.防烫
[名词解释]合轴分枝
[判断题]临时围栏可分为: 固定式和非固定式临时围栏。( )
A.正确
B.错误
[单项选择]小陈是一名画家,他总是疏远他人,思考别人是否干扰了自己。根据霍尼的学说,小陈属于人际关系类型中的()。
A. 逊顺型 
B. 进取型 
C. 疏离型 
D. 竞争型
[单项选择]某女孩8岁,拟全麻+体表降温法浅低温行升主动脉狭窄纠正术。呼吸管理中防止室颤的首选方法为()
A. 定时作深呼吸
B. 减少呼吸道分泌物
C. 轻度呼吸性碱中毒
D. 避免呼吸性酸中毒
E. 酌情使用PEEP
[单选题]下列选项表述不正确的是( )。
A.A.餐厅服务离不开和顾客的交谈
B.B.交谈是人际交往中最基本、最常用,也是最重要的方式
C.C.交谈的技巧包含认真倾听、有声语言、无声语言和丰富的神态
D.D.掌握交谈的礼仪、交谈的艺术、提高自己的语言表达能力,对一名餐厅服务员具有十分重要的作用
[单选题]
A.5
B.10
C.15
D.20
[简答题]为什么要规定机组在80%额定负荷时做真空严密性试验?
[判断题]( )长轨节产生不正常的位移时,必须做好无缝线路的测量工作。
A.正确
B.错误
[多项选择]洋地黄中毒表现为()
A. 恶心,呕吐
B. 心律失常
C. 肢麻木
D. 复视
E. 黄视
[填空题]To begin with, we are witnessing a (32) explosion of "solos" — people who live (33) , outside a family altogether. Between 1970 and 1978, the number of persons aged fourteen (34) thirty-four who lived alone nearly tripled in the United State — (35) from 1.5 million to 4.3 million. Today, (36) fifth of all households in the United States consists (37) a living solo. (38) are all these people losers or loners, forced into the solo life. Many deliberately choose it, at least for a time. Says a legislative aide to a Seattle councilwoman, "I (39) consider marriage if the right person came (40) , but I would not give up my career (41) it."
Looking at an older slice of the population, we find a large number of formerly married people, living on their (42) and, in many eases, decidedly liking it. The growth of such groups (43) created a flourishing "singles" culture and a much pu
[单项选择]男性,20岁,因施工塌方压伤右前胸引起胸痛、呼吸困难,前胸有一块胸壁软化区,并见反常呼吸运动,X线检查示右侧第4~8肋骨骨折,但无血气胸。急救措施应首先选择
A. 给氧
B. 固定胸壁
C. 肋问神经阻滞及骨折处封闭
D. 使用呼吸兴奋药
E. 支气管扩张药
[判断题]进站、接车进路信号机在开放引导信号时,显示一个月白色灯光。
A.正确
B.错误
[单选题]10kV配电线路断线事故对人身危害最大的是( )。
A.三相断线
B.二相断线
C.单相断线
D.二相断线、一相接地
[单项选择]Every profession or trade, every art, and every science has its technical vocabulary, the function of (62) is partly to (63) things or processes with. no names in ordinary English, and partly to secure greater exactness in terminology. (64) , they save time, for it is much more (65) , to name a process than to describe it. Thousands of these technical terms are very (66) included in every large dictionary, yet, as a whole, they are rather (67) the outskirts of the English language than actually within its borders.
Different occupations, however, differ (68) in their special vocabularies. It (69) largely of native words, or of borrowed words that have (70) themselves into the very fiber of our language. (71) , though highly technical in many details, these vocabularies are more familiar in sound, and more generally (72) , than most other technical terms. (73)
A. decreased
B. diminished
C. increasing
D. increased
[填空题] 常见的系统总线根据功能不同可以分为地址总线、( )总线和( ) 总线三大类。 43.CPU能直接访问cache和 ( ) ,但不能直接访问磁盘和光盘。
[判断题]中国特色社会主义理论体系是指导党和人民实现中华民族伟大复兴的正确理论,集中体现着中国特色社会主义的行动指南。
[单选题]管式加热炉以辐射传热的形式将热量传给辐射炉管,使炉管内介质温度(),烟气温度下降。
A.波动
B.降低
C.不变
D.升高
[填空题]存储视频信息的磁盘介质应具有<--NRC-->及以上冗余系统。
[多项选择]脱坡或滑坡抢护方法有()。
A. 固脚阻滑
B. 滤水土撑
C. 滤水后戗
D. 滤水还坡
[单选题]诚信对保险业发展具有重大意义,包括():①诚信是保险业的生命线;②诚信是保险机构的核心竞争力:③诚信是保险企业生存与发展的内在要求;④诚信会降低保险双方对保险市场的信心指数。
A.①②
B.①③
C.①②③
D.①②③④
[单选题]下列哪种方法不是按照沥青路面施工工艺分的?( )
A.层铺法
B.路拌法
C.沥青混凝土
D.厂拌法
[简答题]与同学说话时,要注意什么?
[单项选择]以下病例中应慎用或不用全血:
A. 心衰的患者
B. 急性创伤
C. 大手术,如心脏搭桥手术体外循环
D. 大量失血
E. 器官移植
[单项选择] I have a friend who put her career on hold after she got married and had children. She stayed at home until the oldest was four years old, 56 she began doing part-time jobs to get out of the house. That wasn’t enough, so she took a full-time job, which 57 her to travel. She was making more money than her husband, even 58 four years off the market. Her in-laws, who believe a woman’s only function is housekeeping, 59 to her husband with their negative opinions. Emotionally torn (受折磨的), he wanted to 60 his wife but was conditioned by loyalty (忠诚) to his parents’ ideals. Naturally, his wife also felt 61,eager to purse her vision but emotionally invested in her husband and family. I 62 her to go with her vision, because it’s her life. Too many women give up their career dreams to 63 a relationship. That’s traditional, but it can 64 you crazy. And some dreams, if you don’t purse them in time, will pass you 65 . When you’re finally free to go 66 them, you’ve 67 the window of
A. whether
B. where
C. how
D. which
[判断题]安全带和专作固定安全带的绳索在使用前应进行外观检查。安全带应按相关规程要求定期检验,不合格的不准使用。
A.正确
B.错误
[单选题]内部命令时计算机启动时装入()可以随时直接使用的DOS命令( )
A.内存
B.磁盘
C.网络
D.文件
[单选题]中性点接地系统比不接地系统供电可靠性( )。
A.高;
B.差;
C.相同;
D.不一定;
[单项选择]电空位操作,空气制动阀缓解位通路为()。
A. 作用管通大气
B. 调压阀通作用管
C. 调压阀通均衡风缸
[单选题]AGM通道内通行传感器属于( )类型的传感器。
A.A.红外
B. B.电磁
C. C.温度
D. D.湿度
[单选题]在进入轨道电路分路不良区段作业前,( )必须报告助理值班员内勤(或车站值班员,下同)调车机所处位置、进入线路、本次运行停车位置。
A.调车区长
B.调车长
C.连接员
D.制动员
[单选题]我国面积最大的淡水湖鄱阳湖位于( )省。
A.A.江苏
B.B.浙江
C.C.安徽
D.D.江西
[单选题]药品登记表中不能没有(    )。
A.药效
B.成分
C.副作用
D.药名
[多项选择]

患儿女,7岁,因“右膝、右颈痛9个月”来诊。伴右膝关节微热、肿,晨僵明显,颈部活动受限制。血常规:Hb102g/L,WBC10.9×109/L,PLT342×109/L;CRP775mg/L;ESR110mm/h;补体:C4392mg/L,IgG18.4g/L;ASO、RF、ANA、抗dsDNA、HLA-B27均(-)。诊断:幼年类风湿关节炎。

提示:给予该患儿甲氨蝶呤5mg/周,双氯芬酸钠(扶他林)12.5mg,2次/d治疗。除已用药物外,还可采用的治疗措施包括()
A. 急性期后应适当运动
B. 可采用理疗、热敷、红外线照射
C. 尽早采用阿司匹林和丙种球蛋白,以控制炎症
D. 静脉滴注大剂量青霉素
E. 全面保护患儿,防止其受伤
F. 可加用糖皮质激素等进行抗JRA治疗

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