When the Berlin Wall came down it wasn't just the roads that opened up but the waterways too.柏林墙一倒,不仅是陆路,连水路也开通了。The city is intersected by three main waterways.该城市由3条主要水路贯穿。On the other hand, federal regulation has...
The synthesis, evaluation and field application of 2 - acrylamido - 2 - methylpropanesulfonic acid ( AMPS ) copolymers are introduced.介绍了 AMPS 聚合物的合成 、 评价和现场应用情况.The good effectiveness of AMPS copolymers had been demonst...