Dalian plastic pallet is directly made into a large raft (also known as row) with the felled wood. Because the forest farm is mostly on the mountain and the terrain is high, the raft can be used to directly flow down the river. The raft is both a means of transport and a cargo, which can achieve two goals with one stone. After arriving at the downstream, the wood will be sold to the buyer directly after landing. Rafts are both means of transport and goods, killing two birds with one stone.
After arriving at the downstream, the wood will be sold to the buyer directly after landing. For example, the fangpaizi in Chuang Guandong are relatively primitive and have no power, so they can only float along the river, which is very dangerous. Before, the Yalu River and Songhua River in the Northeast were the main rivers for fangpaizi, In Russia and North Korea, there are still people who put platoons in this way, but they are much better than before. There are some power systems, which are not so dangerous. In general, only a few people put platoons in one place, not so many people who break into Guandong.
Most of Dalian Paizi trade along the Ural River to the sea. The synthesis of ammonia from nitrogen is the fixation of nitrogen, so D is correct. This paper examines the knowledge points such as chemical bond, reaction between substances, solid of nitrogen, etc., and analyzes and solves them according to the knowledge points such as the force between particles in substances, the composition of particles in substances, basic concepts, etc.