短文改错:In recent years, marathons have hecome more popular hut many people trainfor month to run marathonsA marathon is a long-distance running event- usual about 42 kilometers.Many peoplething, running a marathon can help us stay healthy and make us much mere stronger. In additional, they can he enjoyable because A the heautiful sights along theadditionroute. that makes running a good way to relieve our stress. Moreover, we willwhichfeel mare confident after finish a marathonRunning can benefit ourselves in many ways and I will try my best to finish amarathon myself one day

15.【解析】(1)F= ILOcos0=10×0.1×3×10-2×cos60°N=1.5×10-2N(2分)方向垂直于纸面向外(2分)(2)F=IBL=10×0.1×3×10-2N=3×10-2N(2分)力的方向与导线垂直,即与原OA方向成120°角斜向下(2分)

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