热门试题:
[单选题]某泵在运行一段时间后发现有气蚀现象应( )
A.停泵,向泵内灌液
B.降低泵的安装高度
C.检查是否有杂质堵塞管路吸入口
D.检查出口管阻力是否过大
[多选题]安全学习教育制度。定期开展安全法规、安全常识、安全理论、安全警示学习教育,每逢( )等特殊或敏感时期,以及执行重特大特殊灾害救援时,必须开展符合形势任务、气候特点的安全教育,明确安全防事故措施与要求。
A.重大节日
B.重大活动
C.重要节点
D.季节转换
E.入职选退
F.人员变动
[单选题]下列哪项不是实热证的必有表现
A.壮热恶热
B.神昏抽搐
C.便秘尿黄
D.舌红苔黄
E.脉数有力
[多选题]软磁材料的特点是？
A.磁滞回线狭窄
B.具有较小的矫顽力
C.磁导率高
D.磁滞现象不显著
[判断题]消防卫星站使用时,CMR5975接收的E错/N0值至少大于3.6d错才能正常通信。 (难)(音视频系统与应急通信管理)
A.正确
B.错误
[单项选择]人和豚鼠不能自己合成维生素C，因为______。
A. 糖醛酸途径活性太低
B. 缺乏UDPG脱氢酶
C. 缺乏古洛糖酸内酯氧化酶
D. 缺乏古洛糖酸脱氢酶
E. 缺乏UDP-葡萄糖酸焦磷酸化酶
[多项选择]“十二五”时期，建设人才强国，建立健全（）的体制机制。
A. 政府宏观管理
B. 市场有效配置
C. 单位自主用人
D. 人才自主择业
E. 学校做好服务
[判断题]分动外锁闭道岔两尖轨与连接装置、心轨与拉板相互分离时，应及时修理或更换。( )
A.正确
B.错误
[判断题]2.43办理注销登记时，对机动车灭失的，应当审查机动车所有人身份证明和机动车灭失证明。
A.正确
B.错误
[单项选择]
Valentine’s Day may come from the ancient Roman feast of Luperealia. (1) the fierce wolves roamed nearby, the old Romans called (2) the god Lupereus to help them. A festival in his (3) was held February 15th. On the eve of the festival the (4) of the girls were written on (5) paper and placed in jars. Each young man (6) a slip. The girl whose name was (7) was to be his sweetheart for the year.
Legend (8) it that the holiday became Valentine’s Day (9) a roman priest named Valentine. Emperor Claudius II (10) the Roman soldiers not to marry or become engaged. Claudius felt married soldiers would (11) stay home than fight. When Valentine (12) the Emperor and secretly married the young couples, he was put to death on February 14th, the (13) of Lupercalia. After his death, Valentine became a (14) . Christian priests moved the holiday from the 15th to the 14th---Valentin
A. other
B. simply
C. rather
D. all
[单选题]在光纤回路工作时，应采取相应防护措施防止激光对（）造成伤害。
A.手
B.人眼
C.皮肤
D.工具
E./
F./
G./
H./
[单选题]B-D-001323
对卧式数控车床单项切削精度中的外圆精度进行检验的项目有()。
A.圆度是直径的一致性
B.外径尺寸精度
C.径向圆跳动
D.外圆表面的表面粗糙度
[单选题]在电流保护中既有反时限特性的感应元件,又有电磁速断元件的继电器为( )型继电器。
A.DL-11
B.DZ-17/110
C.GL-11
D.DX-11
[单选题]第 349 题, 本小题 1 分
进行电网合环操作前若发现两侧(____)不同，则不允许操作。
A. 频率
B. 相位
C. 电压
D. 相角
[单项选择]下列哪一个描述是因特网比较恰当的定义______
A. 一个协议
B. 一个由许多个网络组成的网络
C. OSI模型的下三层
D. 一种内部网络结构
[单项选择]大气的臭氧层对人体是有益的，因为它能（）
A. 吸收部分紫外线
B. 吸收红外线
C. 吸收全部可见光
[单选题]绝大部分高频电疗的禁忌证
A.局部金属异物、植有心脏起搏器
B.慢性消化系统疾病
C.慢性炎症
D.骨关节炎
E.伤口愈合迟缓
[判断题]锅炉严重满水时,汽温迅速升高,蒸汽管道会发生水冲击。( )
A.正确
B.错误
[多选题]事故调查组应当根据事故调查进展，及时向派出单位主要领导报告（）事故定性情况、善后处理情况。
A.A人员伤亡情况
B.B器材装备情况
C.C发生事故单位情况
D.D事故救援情况
[单项选择]
Business has slowed, layoffs mount, but executive pay continues to roar—at least so far. Business Week’s annual survey finds that chief executive officers (CEOs) at 365 of the largest US companies got compensation last year averaging ＄3.1 million—up 1.3 percent from 1994.
Why are the top bosses getting an estimated 485 times the pay of a typical factory worker That is up from 475 times in 1999 and a mere 42 times in 1980. One reason may be what experts call the "Lake Wobegon effect". Corporate boards tend to reckon that "all CEOs are above average"—a play on Garrison Keillor’s famous line in his public radio show, A Prairie Home Companion, that all the town’s children are "above average". Consultants provide boards with surveys of corporate CEO compensation. Since directors are reluctant to regard their CEOs as below average, the compensation committees of boards tend to set pay at an above-average
A. His idea on the CEOs was recognized by corporate boards.
B. One of his lines had been modified to describe the CEOs.
C. His play pointed out that "all CEOs are above average".
D. His radio program aroused the "Lake Wobegon effect".
[单项选择]
硅酸盐水泥水化后的水泥石中容易被侵蚀的成分是下列中的哪几个？Ⅰ．Ca（OH）2Ⅱ．G3S2H3Ⅲ．CFHⅣ．C3AH6Ⅴ．C3A·3CaSO4·31H2O（）
A. Ⅰ、Ⅱ
B. Ⅰ、Ⅳ
C. Ⅰ、Ⅲ
D. Ⅰ、Ⅴ
[填空题]一只卷毛雌狗A和一只卷毛雄狗B交配，生了一只直毛雌狗和一只卷毛雄狗（卷毛、直毛这对相对性状由H、h基因控制）。请分析回答：子代中，卷毛狗的基因型是（）；直毛狗的基因型是（）。
[单项选择]头目胀痛多见于（）
A. 肝阳上亢
B. 脾胃湿热
C. 肝肾阴虚
D. 中气下降
E. 外感风热
[单项选择]Some people argue that, since there are billions of stars in our (47) _______, at least millions of them must have planets. And if there are millions of planets, at least thousands of them will have life. And of these life forms, at least some will have (48) ________. At some point of technological development, they will think of (49) ________ with beings on other planets.
Some astronomers have set up a radio telescope at Harvard University. Dr. Paul Horowitz is using the telescope to (50) _______ the skies for any signal (51) ________ from other planets.
I have a plea for these gentlemen: please stop before it is too late!
For one thing, what if these beings that are in (52) ________ on other planets do give us a message What if the message indicates that these beings are far (53) ________ to us Will we be able to (54) _________the knowledge of our own unworthiness and inferiority
For another, what if these beings tune in and find us Will they be friendly towards u
[单选题]钢轨头部总磨耗＝垂直磨耗＋（ ）侧面磨耗。
A.1
B.1/2
C.1/3
D.1/4
[多选题]目前糖尿病的常规筛检方法有( )
A.OGTT
B.FPG
C.指尖血血糖
D.HbAlc
E.尿糖
[简答题]【MH】 引起蒸汽压力变化的基本原因是什么?
[单选题]根据桥体所用材料不同可将桥体分为（ ）
A.金属桥体
B.非金属桥体
C.金属-烤瓷联合桥体
D.金属与塑料联合桥体
E.以上都是
[单项选择]当归补血汤主治证候中可见（）
A. 寒热往来
B. 夜热早凉
C. 身热不扬
D. 憎寒壮热
E. 肌热面赤
[填空题]现代炼铁生产的主要设备是( ),其主要产品是生
[单项选择]下列犬常见疾病及其病原体对应正确的是（）
A. 犬传染性肝炎～犬腺病毒I型
B. 犬副流感～细小病毒
C. 犬瘟热～布氏杆菌
D. 钩端螺旋体病～梨形虫
[单选题]576. PLC 的产生之初是为了代替( )。
A.继电控制系统
B.模拟控制系统
C.随机控制系统
D.程序控制系统
[判断题]大型养路机械按重型轨道车运行时，必须全列通风；由机车牵引或编挂在其他工程列车中一起运行时，大型养路机械必须处于无动力状态，且应加入全列车的制动系统。
A.正确
B.错误
[判断题]高温天气露天作业存在高温、高辐射，作业时，人体会出现一系列生理功能改变，这些变化在一定限度范围内是适应性反应，但如超过范围，则会产生不良影响，甚至引起病变。
A.正确
B.错误
[填空题]A security systems
B pension schemes
C transportation systems
D afterdinner speakers
E website designers
F conference venues
G training courses
H promotional packages
[填空题]如在泵口配装带充气电磁阀，一般应（），并与泵同时动作。
[判断题]A类问题指严重违章违纪可能导致发生运营事故和严重后果的问题，是现场作业中应坚决杜绝和日常安全管理上重点防范的问题
A.正确
B.错误
[单选题]对处于群众聚集场所的犯罪分子使用武器的前提是：( )
A.能够确保不伤及他人
B.具备有利地形等条件
C.不使用武器予以制止，将会使犯罪分子逃离
D.不使用武器予以制止，将发生严重危害后果
