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{{B}}Mother Nature Shows Her Strength{{/B}} Tornadoes (龙卷风) and heavy thunderstorms moved across the Great Lakes and into Trumbull County on Saturday evening. The storms were dramatic and dangerous. George Snyder was driving the fire truck down Route 88 when he first noticed that a funnel (漏斗状的) cloud was behind him. "I stopped the truck and watched the funnel cloud. It was about 100 feet off the ground and I saw it go up and down for a while. It was moving toward Bradley Road and then suddenly it disappeared." Snyder said. Snyder only saw one of the funnel clouds that passed through northeastern Ohio on Saturday. In Trumbull County, a tornado turned trees onto their sides. Some trees fell on [单选题]( )套管头顶丝未退到位有可能发生( )。
A. 试压塞试压失效 B. 注脂困难 C. 防磨套无法取放 D. 悬挂器密封失效 [判断题]建构主义认为知识是个体主动建构而成的。
[判断题]可以戴着绝缘手套带电搬迁电气设备、电缆线及带电检修运转设备。
A.正确 B.错误 [判断题]为了避免发生追尾事故,汽车间应保持一定的车间距。当车辆速度为100km/h时,行车间距至少应为50m。( )(易)
A.正确 B.错误 [单选题]足球赛场的暴力事件属于 ( )
A.回避危险引起的突变型 B.特定气氛引起的突变型 C.人际冲突引起的突变型 D.情境性突变模式 [判断题] 娱乐场所行业协会应当依照章程的规定,制定行业自律规范,加强对会员经营活动的指导、监督
A.正确 B.错误 [单选题]双金属温度计的双金属片做成螺旋锥体形状的目的是（）。
A.扩大测量范围 B.提高灵敏度 C.便于维护 D.提高密封性 我来回答: 提交
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