一、密切联系高科技成果 例1 目前许多国家都在研制磁悬浮列车,如图1所示,我国拥有全部自主知识产权的第一条磁悬浮列车试验线已建成.且实现了2000 km无故障运行.一种磁悬浮列车的车厢和铁轨上分别安放着磁体,车厢用的磁体大多是通有强大电流的电磁铁.现有下列 First, close ties with high-tech achievements Example 1 At present, many countries are developing maglev trains. As shown in Figure 1, the first maglev train test line with complete independent intellectual property rights in China has been completed and 2000 km of fault-free operation has been achieved. Magnets are placed on the carriages and rails of a magnetic levitation train, and the magnets used in the cars are mostly electromagnets with powerful currents.