{{B}}Rescue
Platform{{/B}} In the aftermath of the terrorist attacks on the World Trade Center, security experts are trying to develop new ways of rescuing people from buming skysrapers. One idea is a platform capable of flying vertically and hovering in the air like a helicopter. The platform would rise up and down alongside a skyscraper and pick up people trapped in high stories. The idea for the vertical takeoff platform was hatched more than ten years ago by a Russian aerospace engineer, David Metreveli, who has since moved to Israel. Metreveli’s dedsign, called the Eagle, calls for two jet engines that turn four large horizontal propellers. The spinning of the propellers generates the necessary lift, [单选题]腰椎间盘突出切除术最适宜的手术体位是( )
A.侧卧位 B.膀胱截石位 C.俯卧位 D.仰卧位 E.半坐卧位 [判断题]考核方法通常分为普考和抽考。( ) (易)
A.正确 B.错误 [判断题]弹片与滑床板挡肩离缝、挡板前后离缝大于2mm,销钉帽内侧距滑床板边缘大于5mm时,应及时进行修理或更换。
A.正确 B.错误 [多选题]变频器电源输入端接有交流接触器,关于它的作用,论述正确的是( )
A. 作为变频器的电源开关 B. 当电网停电后恢复供电时,防止变频器及电动机自行再启动。 C. 保护功能起作用时切断电源 D. 控制变频器电源通断,从而控制电动机的启动、停止 制水: [单选题]安全工器具应进行国家规定的()和使用中的周期性试验。
A.科技试验、出厂试验 B.型式试验、出厂试验 C.外观检验、出厂试验 D.外观检验、型式试验 E.略 F.略 [多项选择]警告不可适用于( )违反治安管理行为。
A. 制造噪声干扰他人正常生活的 B. 传播淫秽信息 C. 为赌博提供条件 D. 私种罂粟等毒品原植物 我来回答: 提交
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