青少年牙周炎牙齿的松动、移位最为明显的是-我要搜题网

[多项选择]单机试车为以下哪两种( )。
A. 单机联动试车
B. 单机空载试车
C. 单机试运行
D. 单机负载试车

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[多项选择]稿件结构框架合理是指（）
A. 内容各部分关系明确
B. 内容各部分详略有别，互相呼应
C. 各部分内容通过简单重复，达到结构统一
D. 各部分内容相互交叉互相呼应
E. 内容的阐述方式一致

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[单项选择]在商品交易中企业之间相互提供的信用称之为( )。
A. 商业信用
B. 银行信用
C. 租赁信用
D. 国家信用

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[单项选择]患儿，男，1岁。睡眠时哭闹不安、多汗，下肢弯曲呈“O”形腿，诊断为维生素D缺乏性佝偻病。对患儿最佳的护理是（）。
A. 让患儿住单间
B. 多吃红萝卜
C. 多喂鲜牛奶
D. 多到户外运动
E. 避免久站、久行

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[单选题]一张工作票中，同时有检修和试验时，试验前应得到（）的同意。
A.试验负责人
B.工作负责人
C.调度同意
D.工作许可人

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[单项选择]溶菌酶的作用部位是（）
A. 细菌细胞壁的磷壁酸
B. 细菌细胞壁的肽聚糖
C. 细菌细胞膜
D. 细菌核糖体
E. 外膜层

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[判断题]液-液萃取中，萃取剂的用量无论如何，均能使混合物出现两相而达到分离的目的。
A.正确
B.错误

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[判断题]对继电保护装置的基本要求是：可靠性、选择性、快速性和灵敏性。（）
A.正确
B.错误

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[单选题]大客流应急调配备勤人员须保持联络畅通，若接到临时支援通知，原则上预备应急人员及物资应在（）分钟内到位。
A.10
B.20
C.30
D.40

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[简答题]Electronic or "cyber" warfare holds the promise of destroying an army"s or even a whole nation"s—ability to function without hurting human life. The technology is reaching the point, however, where cyber warfare may be decisive in its own right. (46) In highly centralized military operations, communications and data management have become essential tools linking individual small units and the central command structure. The neutron bomb is one of the most horrid weapons ever devised: It doesn"t damage property; it only kills higher life-forms. (47) Wouldn"t the opposite be wonderful, a device like the robot"s ray in The Day the Earth Stood Still, which melts down weapons but not soldiers Electronic or "cyber" warfare—hacking into an enemy"s computers, jamming radio transmissions, and the like—holds that promise. It can destroy an army"s—or even a whole nation"s—ability to function, but does not hurt human life. The United States has very good electronic warfare capabilities, but has used them only to support conventional military operations. The technology is reaching the point, however, where cyber warfare may be decisive in its own right. (48) Before we imagine what such a "cyberwar" scenario might be like, let"s briefly look at how electronic warfare developed. During the Civil War, operations conducted by the Union army against the Confederate telegraph system foretold modern twentieth-century electronic warfare. Union operatives penetrated Confederate lines to tap into and read military traffic on the Confederate telegraph system. (49) Not only did these operations yield valuable intelligence information, but some operators even began sending bogus messages to sow confusion in the Confederate ranks. Just before World War I, radio communication seemed like a real boon to naval operations because it allowed ship-to-ship and ship-to-shore communications, especially in bad weather. Before this time, flags or light blinkers with limited range provided the only means of communication between ships. Naval ship captains, however, were aware that a sophisticated set of shore-based equipment could locate ships by their radio transmission. By listening to the transmissions, the enemy could ascertain the number and type of ships even if they could not decode actual messages. For this reason, the US Navy was particularly resistant to using radio. However, US military observers aboard British warships soon saw that the tactical advantages of radio outweighed the intelligence losses. Electronic warfare grew rapidly in World War II with the advent of radar. (50) Monitoring radar frequencies allowed spoofing or jamming of enemy radar and led to major units and equipment devoted solely to countermeasures and counter-countermeasures. Gathering intelligence from radio transmissions also increased greatly.

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[判断题]火场救人是将受火势围困或其他险情威胁的人员疏散、解救至安全区域,或通过改善被困人员生存环境避免伤亡发生的战斗行动。()
A.正确
B.错误

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[单选题] 变速器处于空挡时有异响,踩下离合器踏板时异响声消失,这种现象属于( )。
A.万向传动装置异响
B.离合器异响
C.手动变速器异响
D.驱动桥异响

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[单选题]不适用《中华人民共和国渔业法》的生产活动是（　　）。
A.海湾养虾
B.水库捕鱼
C.湖泊驯养鸬鹚
D.海湾养殖海带

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[单选题]修改镜腿的弯点长和弯垂角度称为(　　)。
A.镜腿钳
B.平嘴钳
C.平圆钳
D.腿套钳

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[单项选择]根据《担保法》规定，以车辆等交通工具抵押的，抵押合同自( )之日起生效，
A. 抵押物交付
B. 抵押物登记
C. 抵押合同成立
D. 抵押合同登记

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[简答题]在电气化铁路线路上作业，应遵守哪些规定？