城市轨道交通是指列车或车辆以（）为动力、在钢轨上或沿导向轨运行的城市公共交通方式。
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| Swimming is very popular in summer. People like swimming in summer because water makes them 1 cool. If you like swimming but swim in a 2_ place, it may not safe. These years, more than ten people 3 while they were enjoying themselves in the water and _4 _ of them were students. But some people are _5 not careful in swimming.They often think they swim so 6 that nothing can happen to them in water. Summer is here again. If you go swimming in summer, don't forget _7 better swimmers have died in water.They died because they were not careful,not because they 8 swim. So don't get into water when you are alone 9 there is a "No swimming" sign, don't get into water, 10 . If you remember these, swimming will be safer. | ||||
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电磁铁和永磁体产生的磁场如图所示，请标出永磁体A左端的磁极和电磁铁电源的 “十”、“-”极。
什么叫呼吸衰竭？
Which knot should be used to send a man over the side when he may have to use both hands（）.
A.Bowline
B.French bowline
C.Bowline on a bight
D.Running bowline
公司质量方针和目标分别是什么？