热门试题:
[单项选择]关于线性规划模型的可行域,下面()的叙述正确。
A. 可行域内必有无穷多个点
B. 可行域必有界
C. 可行域内必然包括原点
D. 可行域必是凸的
[判断题]继电器磁性材料的导磁率变低,将使工作值和落下值变低。
A.正确
B.错误
[单项选择]手术区皮肤消毒范围()
A. 周围至少15cm以内的皮肤消毒
B. 周围至少5cm以内的皮肤消毒
C. 周围至少10cm以内的皮肤消毒
D. 周围至少20cm以内的皮肤消毒
E. 周围至少25cm以内的皮肤消毒
[判断题]对煤粉锅炉燃用高挥发分的煤时其煤粉可粗一些。()
A.正确
B.错误
[单选题]Thinner isn’t always better.A number of studies have 1_that normal-weight people are in fact at higher risk of some diseases compared to those who are overweight.And there are health conditions for which being overweight is actually_2_.For example,heavier women are less likely to develop calcium deficiency than thin women.3 among the elderly,being somewhat overweight is often an_4 of good health.Of even greater 5 is the fact that obesity turns out to be very difficult to define.It is often defined 6_body mass index,or BMI.BMI 7 body mass divided by the square of height.An adult with a BMI of 18 to 25 is often considered to be normal weight.Between 25 and 30 is overweight.And over 30 is considered obese.Obesity,8,can be divided into moderately obese,severely obese,and very severely obese.While such numerical standards seem 9,they are not.Obesity is probably less a matter of weight than body fat.Some people with a high BMI are in fact extremely fit,10 others with a low BMI may be in poor 11.For example,many collegiate and professional football players 12 as obese,though their percentage body fat is low.Conversely,someone with a small frame may have high body fat but a 13 BMI.Today we have a(an)_14_to label obesity as a disgrace.The overweight are sometimes_15_in the media with their faces covered.Stereotypes_16_with obesity include laziness,lack of will power,and lower prospects for success.Teachers,employers,and health professionals have been shown to harbor biases against the obese._17_very young children tend to look down on the overweight,and teasing about body build has long been a problem in schools.Negative attitudes toward obesity,_18_in health concerns,have stimulated a number of anti-obesity_19_.My own hospital system has banned sugary drinks from its facilities.Many employers have instituted weight loss and fitness initiatives.Michelle Obama launched a high-visibility campaign_20_childhood obesity,even claiming that it represents our greatest national security threat.20选?
A.for
B.against
C.with
D.without
[判断题]钻孔时严禁用手握住工件。 ( )
A.正确
B.错误
[判断题]审计部门应当按照内部审计工作规定,对财政收支、财务收支以及其他经济活动等财经管理情况组织实施审计。 ( )
A.正确
B.错误
[多选题]产品进入灭菌柜后经过( )、( )、( )三个阶段后,灭菌过程完成( )
A.升温
B.保温
C.泄压
D.降温
[单项选择]在0.25mol/L次氯酸(HClO)的Ka=3.2×10-8溶液中,CH+和电离度分别为:
A. 8.9×10-5mol/L,0.036%
B. 8.0×10-9mol/L,3.2×10-6%
C. 8.0×10-9mol/L,0.036%
D. 8.9×10-5mol/L,3.2×10-6%
[单选题]淀粉酶的生化特性不包括
A.根据器官来源可分为唾液淀粉酶和胰腺淀粉酶
B.淀粉酶在乙酸纤维素膜电泳时可分为6个亚型
C.淀粉酶在SDS-PAGE电泳时可有1~7个条带
D.血清中可出现巨淀粉酶,其是淀粉酶与血浆白蛋白聚合而成
E.血清中巨淀粉酶在电泳时γ球蛋白区
[判断题]当遂行危险化学品仓库、重点实验室和研究机构、高新企业等重点目标保护任务时,应首先询问知情人,初步了解建筑功能布局和重点部位等情况,组织内部侦察,查明其受水势威胁的程度,确定采取保护的途径和方式等。( )
A.正确
B.错误
[单项选择]关于正常人体"津液"的描述,错误的是
A. 是机体一切水液的总称
B. 是构成人体的基本物质
C. 是维持人体生命活动的基本物质
D. 具有滋润和濡养作用
E. 津和液之间可以相互转化
[单选题]根据《建设工程工程量清单计价规范》GB 50500-2013,承发包过程中必须实行清单计价的是( )。
A.国有投资的建设工程
B.投资100000万元以上的工程
C.公共设施建设项目
D.基础设施建设项目
[单选题]我国基金税收的政策法规文件包括( )年发布的《关于企业所得税若干优惠政策的 通知》。
A.2005
B.2006
C.2007
D.2008
[单选题]肾功能不全者慎用的含砷类中药是
A.朱砂
B.轻粉
C.雄黄
D.红粉
E.升汞
[单选题]在命令 fr map ip 10.1.1.2 200 中,数字 200 的含义是( )。
A.对端逻辑通道编号
B.本端 DLCI 编号
C.对端接口编号
D.对端节点编号
[单选题]调校验讫章时,( )负责监督,( )负责试盖,( )必须签名。
A.科队值班领导,执勤人员,执勤人员
B.勤务值班员,执勤人员,执勤人员
C.科队值班领导,执勤人员,科队值班领导
D.科队值班领导,执勤人员,科队值班领导和执勤人员
[单选题]电弧焊作业时,错误的做法是()。
A.焊接和配合人员必须采取防止触电、瓦斯中毒和火灾等事故的安全措施
B.焊接设备上的电机、电器、空压机等应有完整的防护外壳
C.雨天不得露天电焊
D.焊接预热件时,现场应设置通风设施降低焊件发出的辐射热
[单选题]张某是甲市乙县的人大代表,对张某提请批准逮捕的许可机关是()。
A.乙县公安机关
B.乙县人民检察院
C.乙县人民代表大会常务委员会或主席团
D.甲市人民代表大会主席团或常务委员会
[单选题]接受工作票,审查工作的必要性是( )的职责。
A.监护人
B.工作票许可人
C.工作票负责人
D.值班负责人
[单选题]攻击者在完全掌握通信协议原理后,通过发送错误的控制状态或信息,误导操作人员或控制组件的操作。这种数据攻击途径属于( )攻击方式
A.重放攻击
B.数据注入攻击
C.数据篡改攻击
D.中间人攻击
[不定项选择题]下列有关苯妥英钠的叙述中哪项是错的 ( )
A.治疗某些心律失常有效
B.能引起牙龈增生
C.能治疗三叉神经痛
D.治疗癫痫大发作有效
E.口服吸收规则,T1/2个体差异小
[单项选择]砂浆回弹法检测时,砌筑砂浆的龄期不应低于().
A. 7天
B. 14天
C. 21天
D. 28天
[单项选择]若检测条件相同时,对铁质试件(原子序数26)中一缺陷内含下列哪种材质,其影像对比度最佳?()
A. 锂(原子序数2)
B. 钠(原子序数11)
C. 铝(原子序数13)
D. 钙(原子序数20)
[单选题]AD040 烯烃分子内如果不止一个双键,则每增加一个双键,通式中减少( )氢原子。
A.1个
B.2个
C.3个
D.4个
[多选题]安全管理是队伍建设( )的基础工作,是有效履行职责使命的基本保证。
A.反复性
B.综合性
C.经常性
D.时效性
[单项选择]Everyone has a moment in history, which belongs particularly to him. It is the moment when his emotions achieve their most powerful sway over him; and afterward when you say to this person "the world today" or "life" or "reality", he will assume that you mean this moment, even if it is fifty years past. The world, through his unleashed motions, imprinted itself upon him, and he carries the stamp of that passing moment forever.
For me, this moment---four years in a moment in history--was the war. The war was and is reality for me. I still instinctively live and think in its atmosphere. These are some of its characteristics: Franklin Delano Roosevelt is the president of the United States, and he always has been. The other two eternal world leaders are Winston Churchill and Joseph Stalin. America is not, never has been, and never will be what the songs and poems call it, a land of plenty. Nylon, meat, gasoline, and steel are rare. There are too many jobs and not enough workers. Mon
A. Reality is what you make of it.
B. Time is like a river.
C. Emotions are powerful.
D. Every person has a special moment.
[判断题]青藏线格拉段发往全路各站的旅客,除直通车外,不办理直通业务;全路各站发往青藏线格拉段(不含格尔木)的旅客,可办理直通业务。
A.正确
B.错误
[多选题]滑动轴承由( )等三部分组成
A.轴承座
B.轴承盖
C.轴瓦
D.底座
[单项选择]女性,43岁,因头痛伴呕吐、双眼视物不清4个月收入院。体检:神清;视力:左眼前数指,右大致正常;眼底:左视盘边缘色淡。右视盘边缘不清、盘隆起2D。为明确诊断,首先应安排的检查是()。
A. 视觉诱发电
B. 脑电图
C. 脑脊液免疫球蛋白
D. 头部CT或MRI
E. 视野
[单选题]在发动机警告显示上由半个琥珀色方框框住的机载燃油表示:
A.燃油量表降等级
B.所有燃油不能完全使用
C.左侧燃油量表降等级
D.右侧燃油量表降等级
[填空题]13号线电客车盘式制动单元具有________功能,保证闸片间隙始终保持在规定的范围内。
[单选题]钻削工件时,严禁用( )拿持工件进行加工。
A.手
B.工具
C.两者都行
[多项选择]嗜酸性粒细胞增多可见于
A. 荨麻疹或血管神经陛水肿
B. 牛皮癣、湿疹、天疱疮
C. 肺吸虫病、钩虫病、血吸虫病
D. 高脂血症
E. 嗜酸性粒细胞白血病
[判断题]使用尾纤自环光口,发光功率过小时,应串入合适的衰耗(减)器。
A.正确
B.错误
[判断题]( )在有砟桥上,护轨顶面不应高出基本轨顶面10mm,也不应低于25mm。
A.正确
B.错误
[判断题]基建承包商是指在公司基建项目中提供勘察设计、监理、施工、咨询、试验等服务的企业。
A.正确
B.错误
[单项选择]振荡回路中电流大,且频率较高。在此回路中所采用的紧固件,最好为( )。
A. 电磁材料
B. 绝缘材料
C. 非磁性材料
D. 磁性材料