| Today’s lecture is about two powerful
natural forces, one destructive, yet the other productive. Tornado (龙卷风) is a typical example of destructive forces in nature. Forces other than damaging winds are also at work inside tornadoes. Sometimes as twisting, screaming wind passes over house, the walls and the ceiling burst apart as if a bomb had gone off inside. This explosion is caused by the low air pressure at the center of a tornado. The pressure at the center of a tornado is usually 13 pounds per square inch. However, inside the house the air pressure is normal, about 15 pounds per square inch. The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado passes over a small building that measures 20 by 10 feet. On each square inch of the bui A. unimportant thing B. hard job C. great event D. incredible thing [判断题]调车手信号指挥机车向显示人反方向稍行移动的信号，昼间为拢起的红色信号旗直立平举、再用展开的绿色旗上下小动，夜间用绿色灯光上下小动。
A.正确 B.错误 [单项选择]西服的领子一般分为三种，分别为平驳领、枪驳领和（）。
A. 意大利领 B. 尖角领 C. 温莎领 D. 青果领 [单选题]车挡表示器设置在线路终端的（ ）上。
A.挡车器 B.线路 C.枕木 D.车挡 [单项选择]If you want to buy this house, the payment may be made in five （）.
A. installments B. pieces C. shares D. parts [判断题]《上海铁路局普速旅客列车“三乘检查”管理办法》（上铁客〔2017〕396号）规定：《上海铁路局普速旅客列车“三乘检查”管理办法》适用于全局普速旅客列车（包含旅游列车）“三乘检查”工作。。
A.正确 B.错误 [判断题] 车间员工焊接作业、冲压作业时,可不用佩戴防护用品,对身体无伤害。()
A.正确 B.错误 [判断题]实行“一国两制”解决台湾问题的前提是和平统一。
[判断题]平顶型油罐的结构简单，受力后有较大变形，承压能力较差。
A.正确 B.错误 [判断题]脱轨表示器显示带白边的红色圆牌及红色灯光，表示线路在遮断状态。( )长方牌（2015年上半年）
A.正确 B.错误 我来回答: 提交
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