热门试题:
[多项选择]在输电线路上，采用900接线的功率方向继电器构成方向性保护时，功率方向继电器存在电压死区。消除电压死区的方法是（）。
A. 引入健全相电压
B. 提高动作灵敏度
C. 使用负序电压
D. 采用电压记忆
[单选题]电液换向阀的先导阀是()机能。
A.O型
B.I1型
C.Y型
D.M型
[单项选择]肝硬化食管胃底静脉曲张破裂出血的首选治疗方法
A. 三腔两囊管压迫止血
B. 洛塞克
C. 胃复安
D. 丙谷胺
E. 硫糖铝
[单选题]患者男,47岁。行腰椎间盘髓核摘除术,以下术后护理措施,哪项不正确( )
A.保持腰部制动,应予轴线翻身
B.术后一般卧床7~10天
C.注意观察下肢的感觉、运动及大小便情况
D.腰围护腰3~6天
E.术后即可指导腰背肌锻炼,防止神经根粘连
[不定项选择题]共用题干
Just one hour's listening to an MP3 player can damage hearing,claim scientists.It causes temporary changes in hearing sensitivity which may lead to long-term harm,according to a new study.
The findings show over -stimulation of hair cells within the ear occurs even at varying volume levels for short periods of time.The study of almost 60 young people carried out by researchers at Ghent University,Belgium,is published in the Archives of Otolaryngology -Head&Neck Surgery journal.
It follows previous warnings from doctors that using MP3 players at high volumes with earphones that fit into the ear canal could lead to loss of hearing. In the latest study,21 people aged 19 to 28 years were exposed to pop and rock music using MP3 players at varying volumes for one hour. A second group of 28 men and women were a control group who were not exposed to MP3 music.
Hearing tests were carried out before and after the exposure,which found significant threshold or emission shifts were observed between almost every session of the noise exposure group compared with the control group.Lead researcher Hannah Kempler said:Excessive noise exposure can lead to metabolic and mechanical effects resulting in alterations of the structural elements of the inner ear that contains auditory sensory cells or"hair cells".
The European Commission has warned up to 10% of 30-year-old would have to wear a hearing device within the next decade because they listen to music too loudly through headphones.Surveys showed more than 90% of young people in Europe and the U.S.used MP3 players,often for several hours a day at maximum volume.Hearing experts recommend the 60/60 rule一listening to MP3 players for no more than 60 minutes at a time at 60% of maximum volume.Concern among EU health and safety officials has led to plan to ensure all MP3 players have the same maximum volume of 85 decibels(d
B)一although users may be able to individually override it at their own risk.
Not much difference was found between the exposure group and the control group according to the hearing tests after the exposure.
A.Right
B.Wrong
C.Not mentioned
[填空题]动态存储器的刷新是按（）（填行或列）进行；若存储单体的容量为64K，采用双译码且地址线平均送到两个译码器中，则刷新地址计数器的模为（）。
[单选题]BC026 在大门入口处设置防尘格,铺上( ),以防止或减少行人将尘土、沙石带进室内。
A.木屑
B.地毯
C.踏脚垫
D.海绵垫
[多选题]关于DTE板指示灯含义描述正确的有（ ）。
A.A、运行状态指示灯为红色
B.B、运行状态指示灯为绿色
C.C、PCM1-8正常运行是为常亮
D.D、PCM1-8正常运行是为常灭
[单选题]现场防护人员应站在距施工地点的( )附近，且瞭望条件较好的地点显示停车手信号。
A.20m
B.50m
C.第一个响墩内20m
D.最后一个响墩内20m
[判断题]偿债备付率=（借款偿还期内息税前利润+折旧+摊销-企业所得税）/应还本付息金额。
A.正确
B.错误
[单项选择] A few months ago, on a trip to Africa, I met with a group of women in Kibera, the biggest slum in Kenya. These women ranged in age from 16 to 45 but had one thing in common: AIDS had devastated their lives. A woman I’’ll call Chanya told me her story. Chanya is a mother in her 30s trying to raise four children. She does not fit the typical profile of a person living with AIDS— at least not the profile that prevails in the West. She is not a man who has sex with men; she is not a sex worker; she does not use IV drugs. She has engaged in no behavior at all that is high risk for AIDS, except for one— she got married. Her husband, tragically, did engage in high-risk behavior: he had unprotected sex outside his marriage.
Chanya’’s story is not rare.
Why are women so vulnerable Physiological differences make women twice as likely as men to contract HIV from an infected partner during sex. In many countries, sexual inequality compounds the hazard by making it difficult, if not
A. a political essay
B. a novel
C. an scientific report
D. a news report
[单选题]立、 撤杆塔过程中，除指挥人及指定人员外，其他人员应在处于杆塔高度的（ ）距离以外。
A.1.1倍
B.1.4倍
C.1.3倍
D.1.2倍
[单选题]工作人员()擅自移动或拆除遮栏、标示牌。
A.可以
B.不应
C.允许
D.视情况可
[判断题]国家行政机关、监察机关、审判机关、检察机关都由人民代表大会产生，对它负责，受它监督。
A.正确
B.错误
[单选题]泽雨产流过程中的地下水入渗方式是（）。
A.水动力弥散
B.淋溶
C.稳定渗流
D.非饱和渗流
[判断题]有限空间作业监护人可同意未经授权的人员进入作业区域。
A.正确
B.错误
[单选题]盾构机后配套系统配置的各个系统中,不建议使用干粉灭火器的是( )。
A.
膨润土系统
B.
工具间
C.
控制柜
D.
注浆系统
[判断题]触电急救过程中，与医务人员接替时，应提醒医务人员在触电者转移到医院的过程中不得长时间间断抢救。（ ）
A.正确
B.错误
[判断题]承销协议和承销团协议可以在股票发行价格确定后签订。
[简答题]铁路建设、运输、设备制造维修单位的工作人员应当严格执行规章制度，实行标准化作业，保证铁路安全。
[单项选择]荧光抗原直接法是（）
A. 将荧光素直接标记在第一抗体上
B. 将辣根过氧化物酶标记在抗原上
C. 将荧光素标记在第二抗体上
D. 将荧光素直接标记在抗原上
E. 将碱性磷酸酶标记在抗原上
[判断题]儿童票的座别应与成人车票相同，其到站不得远于列车的终到站。
A.正确
B.错误
[判断题]悬挑式操作平台的搁支点和上端拉结点,都必须位于建筑物的结构上,不得做在脚手
架等施工设施上。
A.正确
B.错误
[判断题]汽车由发动机、底盘、电气设备和车身四部分组成。( )
A.正确
B.错误
[多项选择]患者男，71岁，因左侧面颊部疼痛两三年入院，疼痛呈针刺样，分布在左唇部及鼻翼旁，每次发作持续5～20秒钟，吃饭，说话等可诱发疼痛。口服卡马西平0.1g，tid效果欠佳，加量后伴有头晕症状。患者最终决定行半月神经节射频毁损术，术后患者疼痛明显缓解，仍偶有舌根部放电样疼痛，程度较剧烈，考虑可能是下列哪种情况？（）
A. 患者为非典型性面痛
B. 半月神经节射频毁损不完善
C. 患者术后半月神经节仍为水肿期，水肿刺激引起疼痛
D. 该患者为三叉神经痛伴发舌咽神经痛
E. 牙痛放射造成
F. 穿刺损伤面神经
[判断题]电力系统中，只要零序网络保持不变，则在同一地点发生单相接地故障，零序电流也不变。( )
A.正确
B.错误
[单项选择]主要用于诊断和鉴别库欣综合征的是 （）
A. TRH兴奋试验
B. ACTH兴奋试验
C. 地塞米松抑制试验
D. 生长激素运动兴奋试验
E. T3抑制试验
[单选题]根据《反恐怖主义法》的规定,下列关于技术侦察的说法正确的是( )。
A.甲县公安机关在侦查恐怖犯罪案件中,为获取有关证据,经过严格的批准手续,可以使用技术侦察措施
B.技术侦察措施的适用对象是犯罪嫌疑人、被告人以及与犯罪活动直接关联的人员
C.甲县公安机关依法采取技术侦察措施获取的材料,只能用于应对处置,不可以作为刑事诉讼的证据
D.只有公安机关、国家安全机关、军事机关可以采取技术侦察措施
[简答题]工务段线路维修计划编制的主要内容有哪些?
[单选题]试验装置金属外壳应根据要求可靠接地,试验电源应装有（）.并使用有明显断开点的双极刀闸。
A.A、保险
B.B、漏电保安器
C.C、断路器
D.D、刀闸
E.略
F.略
[简答题]37税务机关对行政相对人个人及其所扶养家属维持生活必需的住房和用品，不得实施税收保全和制执行，下列不属于生活必需的包括
[填空题]木枕线路轨道静态几何不平顺容许偏差管理值包括( )、计划维修和临时补修。
[单选题]投资人购买储蓄国债（凭证式）的说法不正确的是 （ ）
A.、从购买之日开始计息
B.、到期一次还本付息，不计复利
C.、逾期兑付加计利息
D.、逾期兑付不加计利息
