热门试题:
[单项选择]实现VPN的关键技术主要有隧道技术、加/解密技术、 (9) 和身份认证技术。如果需要在传输层实现vPN,可选的协议是 (10) 。
A. L2TP
B. PPTP
C. TLS
D. IPSec
[多选题]邓小平关于社会主义市场经济理论的内涵包括 ( )
A.市场经济是资源配置的一种方式
B.市场经济不具有社会制度的属性,市场经济可以与公有制相结合
C.市场调节可以与计划调节相结合
D.市场经济更有利于促进生产力的发展
[不定项选择题]共用题干
Less Is More
It sounds all wrong一drilling holes in a piece of wood to make it more resistant to
knocks.But it works because the energy from the blow gets distributed throughout the wood
rather than focusing on one weak spot.The discovery should lead to more effective and
lighter packaging materials.
Carpenters have known_________(1)centuries that some woods are tougher than
others. Hickory (山核桃木),for example, was turned into axe handles and cartwheel
spokes(轮辐)because it can absorb shocks without breaking.White oak,for example,
is much more easily damaged,_________(2)it is almost as dense.Julian Vincent at
Bathe University and his team were convinced the wood's internal structure could explain the
differences.
Many trees have tubular(管的)vessels that run_________(3) the trunk and carry
water to the leaves.In oak they are large,and arranged in narrow bands,but in hickory
they are smaller, and more evenly distributed.The researchers_______(4)this
layout might distribute a blow's energy throughout the wood,soaking up a bigger hit.To
test the idea , they drilled holes 0._________(0.) 65 millimetres across into a block of spruce(云杉),a
wood with_________(5)vessels,and found that________(6)with stood a harder
knock.__________(7)when there were more than about 30 holes per square centimetre
did the wood's performance drop off.
A uniform substance doesn't cope well with knocks because only a small proportion of
the material is actually_________(8).All the energy from the blow goes towards breaking
the material in one or two places,but often the pieces left_________(9)are pristine(未
经破坏的).
But instead of the energy being concentrated in one place,the holes provide many
weak spots that all absorb energy as they break,says Vincent. "You are controlling the
places_________(10)the wood breaks,and it can then absorb more__________(11),
more safely."
The researchers believe the principle could be applied to any material一______(12)
example,to manufacture lighter and more protective packaging.It could__________(13)
be used in car bumpers,crash barriers and armour for military vehicles,says Ulrike
Wegst,_________(14)the Max Plank Institute for Mental Research in Stuttgart.But she
emphasizes that you________(15)to design the substance with the direction of force in
mind."The direction of loading is crucial,"she says.
_________(15)
A.have
B.must
C.should
D.had
[多选题]下列( )属于D类事故苗头。
A.直接经济损失人民币 10 万元以上 20 万元以下
B.擅自切除客运列车车载信号保护动车
C.错挂、漏挂、错撤、忘撤接地线
D.错发、错传、漏发、漏传调度命令,耽误列车运行
E.未撤除防溜措施动车
[单项选择]正线重型轨道应铺设钢轨的型号为()。
A. 75kg/m
B. 60kg/m
C. 50kg/m
D. 43kg/m
[单项选择]
Many different meanings have been given to the word poetry. It would weary my readers if I were to discuss which of these definitions ought to be selected; I prefer telling them at once that which I have chosen. In my opinion, Poetry is the search after, and the delineation of, the Ideal.
The Poet is he who, by suppressing a part of what exists, by adding some imaginary touches to the picture, and by combining certain real circumstances that do not in fact happen together, completes and extends the work of nature. Thus the object of poetry is not to represent what is tree, but to adorn it and to present to the mind some loftier image. Verse, regarded as the ideal beauty of language, may be eminently poetical; but verse does not of itself constitute poetry.
I now proceed to inquire whether among the actions, the sentiments, and the opinions of democratic nations there are any which lead to a conception of the ideal, and which may for this reason be considered as na
A. It limits writing
B. It enhances writing
C. It embellishes writing
D. It deepens writing
[单项选择]在镗床上采用()适用于加工精度要求不高工件。
A. 移动式找正定位
B. 特殊的带有圆柱的直尺找正定位
C. 用等高块及平行直尺找正定位
D. 利用样板找正定位
[单选题]无线图像传输系统中,3.5GHz的无线接入系统采用( ),基于DOCSOS协议。
A.扩频技术
B.采用64QAM、16QAM和QPSK三种调制方式
C. FDD双工方式
D. OFDM正交频分复用技术
[单选题]上颌结节传导阻滞麻醉时,进针方向是
A.向上后
B.向后外
C.向上后外
D.向后内
E.向上后内
[单项选择]原发性腹膜炎最常发生的年龄是( )。
A. 60岁以上妇女
B. 40~60岁女性
C. 60岁以上男性
D. 10岁以下女孩
E. 10岁以下男孩
[单选题]有助于诊断肝性脑病的血液化验指标是
A. 球蛋白
B. 丙氨酸氨基转移酶
C. 白蛋白
D. 血小板计数
E. 血氨
[单项选择]不是CDZ53举高消防车向下变幅时发抖不平稳,或无法下降故障原因的是()
A. 变幅油缸两铰链在同一直线上
B. 变幅平衡阀出现故障
C. 电液比例流量控制不住
D. 电液比例先导阀输出电流不稳
[单项选择]路政设计中立交桥的使用是运用了()原理。
A. 嵌套原理
B. 部分与整体分离原理
C. 空间维数变化原理
D. 反向作用原理
[判断题]不需要办理许可手续的配电第二种工作票,由工作负责人向工作票签发人提出申请,得到同意后给予办理。
A.正确
B.错误
[单选题]《道岔综合维修验收评分标准》规定:心轨凸缘螺栓缺少、松动,每个扣(??? )分。
A.4
B.8
C.16
D.41
[单选题]生产经营单位应制定应急演练计划,根据本单位的事故预防重点,每( )至少组织一次综合应急预案演练。
A.月
B.季度
C.半年
D.年
[单选题]学习马克思主义基本原理的根本方法:
A.认真学习马克思主义的著作
B.一切从实际出发
C.理论联系实际
D.实事求是
[单项选择]我国历史上第一部断代史作者是()。
A. 司马迁
B. 董仲舒
C. 班固
D. 范晔
[单项选择]下面概念中,不属于面向对象方法的是 ______。
A. 对象、消息
B. 继承、多态
C. 类、封装
D. 过程调用
[判断题]触电者脱离电源后,救护者在救护过程中特别是在杆上或高处抢救伤者时,要注意自身和被救者不要触及附近带电体,防止再次触及带电设备。
A.正确
B.错误
[单选题]在雷暴型和强冷锋型风切变中,常伴有低空滚轴状云,这种云的出现,预示有强烈的地面风和( )来临。
A.雷暴
B.低空风切变
C.冰雹
D.强降水
[单项选择]麻醉药品片剂处方不得超过()
A. 一次用量
B. 三日用量
C. 七日用量
D. 三日极量
E. 七日极量
[判断题]AFTN电报报文由几个选定的数据编组构成,可按任意顺序排列编组,且编组可以缺省。
A.正确
B.错误
[单项选择]水发有两种方式,它们是()。
A. 冷水发热水发
B. 煮发蒸发
C. 浸发漂发
D. 焖发泡发
[单选题]精神病人违反治安管理不予处罚的,公安机关应当责令( )严加看管和治疗。
A.居(村)民居委会
B.精神病医院
C.其监护人
D.社区
[多项选择]排列图是一种常见的质量控制统计分析方法,它可用于()。
A. 分析造成质量问题的薄弱环节
B. 评价生产过程的能力
C. 掌握质量数据的分布规律
D. 分析质量控制措施的有效性
E. 找出生产不合格品最多的关键过程
[单项选择]反应器平均温度计算()
A. ∑每床层平均温度×(单床层催化剂重量/催化剂总重量)
B. ∑每床层温度×(单床层催化剂重量/催化剂总重量)
C. ∑每床层平均温度×(单床层催化剂体积/催化剂总重体积)
[单选题]脑血栓形成病人头部不宜冷敷的原因是因为冷敷可使( )
A.血管收缩
B.血管舒张
C.血管破裂
D.血流增快
E.血流增加
[单项选择]接头型式检验试件数量不少于()个。
A. 3
B. 6
C. 9
D. 12
[单选题]接触网带电部分至机车车辆或装载货物的距离,不小于()mm。
A.200
B.250
C.300
D.350
[单项选择]男性,20岁。1年来中上腹时有疼痛,痛向背部放射,尤以夜间为甚,且先后有3次黑便。GI无异常发现,该患者的诊断宜考虑为()
A. 球后溃疡
B. 幽门管溃疡
C. 胰腺癌
D. 胆道出血
E. 结肠癌
[单选题]患者,女性,26岁,行膀胱镜检查后出现血尿和疼痛。为患者采取的护理措施不包括
A.镇静止痛
B.应用止血药
C.嘱少饮水,减少排尿
D.加强营养支持
E.应用抗生素
[单选题]下列各项中,可用来考察借款人资信及与银行往来情况的是( )
A.借款人的财务状况
B.借款人的经济效益
C.不良贷款比率
D.还款来源
[判断题]土地位置的固定性也决定了土地市场是一种完全的市场。( )
[单选题]在应填用电力通信工作票的范围内进行通信故障紧急抢修时,填用电力通信工作票,电力通信工作票可不经书面签发,但应经工作票签发人同意,并在工作票备注栏中说明。
A.正确
B.错误
C./
D./
E./
F./
[多选题]风险管理即运用系统的观念和方法研究风险与环境之间的关系,运用安全系统工程的理念,通过()风险,并在此基础上有效控制风险,用最经济合理的方法来综合处置风险,以实现最大安全保障和最经济的科学管理方法。
A.识别
B.评价
C.量化
D.分析