The biggest safety threat facing
airlines today may not be a terrorist with a gun, but the man with the portable
computer in business class. In the last 15 years, pilots have reported well over
100 incidents that could have been caused by electromagnetic interference. The
source of this interference remains unconfirmed, but increasingly, experts are
pointing the blame at portable electronic devices such as portable computers,
radio and cassette players and mobile telephones. RTCA, an organization which advises the aviation (航空) industry, has recommended that all airlines ban (禁止) such devices from being used during "critical" stages of light, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines p A. is in favor of prohibiting passengers’ use of electronic devices completely B. has overestimated the danger of electromagnetic interference C. hasn’t formed his own opinion on this problem D. regards it as unreasonable to exercise a total ban during flight [单选题]按风险矩阵法(简称LS)全风险等级判定准则(R值)判定为10分,则该风险属于()。
A.A.1级 B.B.2级 C.C.3级 D.D.4级 [单选题]组立铁塔前,基础须经过中间验收并合格,分解组塔时,混凝土的抗压强度达到设计强度的( )。
A.50% B.60% C.70% D.80% [单项选择]两系统之间进行准同步时,必须满足( )。
A. 电流相同、电位相同、频率相等; B. 电压相等、电位相同、频率相等; C. 电压相等、相角相同、频率相等; D. 电压相同、电位相同、功率相同。 [单选题]列车中车辆软管的连结,有列检作业的始发列车由( )负责。
A.调车作业人员 B.列检人员 C.机车乘务员 D.车辆乘务人员 [单项选择]水预熟处理法应注意营养、风味的变化,尽可能()。
A. 煮至软烂 B. 不过度加热 C. 使原料味道互相渗透 D. 使味道浓郁 [单项选择]下述对上颌尖牙牙冠唇面形态的描述,不正确的是
A. 唇轴嵴较明显 B. 唇面外形高点在颈1/3处 C. 唇面分为两个斜面 D. 尖牙唇面形态呈五边形 E. 两条牙尖嵴相交成90° [单选题]硫酸钾厂有( )个钾混盐成品盐池(加扩能)。
A.12 B.5 C.7 D.6 [单选题]若需在35kV电压等级进行等电位带电作业时,应采取可靠的()措施。
A.A.安全 B.B.技术 C.C.绝缘隔离 D.D.屏蔽 [单项选择]一个关系型数据库文件中的各条记录( )。
A. 前后顺序可以任意更改,不影响数据库中数据关系 B. 前后顺序不可以任意更改,需要按照输入顺序排列 [填空题]凡化学反应能够满足滴定分析要求的,都能用于()测定。
[多选题]安全生产工作应当以人为本,坚持( ),坚持安全第一、预防为主、综合治理的方针,从源头上防范化解重大安全风险
A.安全发展理念, B.人民至上、生命至上 C.把保护人民生命安全摆在首位 D.树牢安全发展理念 [单选题]()可确定液体生产、加工、储存的火灾危险性分类。
A.燃点 B.着火点 C.闪点 D.自燃点 [判断题]消防用电设备的配电线路,当采用绝缘和护套为不延燃材料的电缆时,可不穿金属管保护,但应敷设在电缆井内。( )
A.正确 B.错误 [单选题]隐患即事故问责必须以事实为依据,以( )为准绳,遵循实事求是、尊重科学的原则。
A. 行业标准、国家规范 B. 法律法规、标准规范和企业管理制度 C. 局标化图册、可视化管理图册 D.“三个标准” [单项选择]IDE接口是为()的连接而设计的。
A. 硬盘 B. 内存 C. 光驱 D. U盘 [单选题]大量输注库存血后要防止发生()。
A.碱中毒和低血钾 B.碱中毒和高血钾 C.酸中毒和低血钾 D.酸中毒和高血钾 E.低血钾和低血钠 我来回答: 提交
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