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我国矿产资源丰富,是目前世界上矿物种类最多的国家,并具有许多趣闻,现介绍二则,以飨读者。纸硬如钢。在造纸的时候,往纸浆里掺些很细的金属纤维,搅拌均匀就能制成一种新颖奇特的金属纤维纸。把这种纸再用一种胶水一层一层粘起来,其强度每平方公分可达600公斤,被称为“纸钢”。据试验,用这种“纸钢”架设一座长15米的桥梁,吉普车可安全通过。此外,用这
China is rich in mineral resources and is the country with the most mineral species in the world at present. It has many anecdotes and is now introducing two books to readers. Paper hard as steel. In the papermaking process, to the pulp mixed with very fine metal fibers, stir can be made into a novel and unique metal fiber paper. This kind of paper and then glue a layer of glue up, the strength of up to 600 kg per square centimeter, known as the “paper steel.” According to the test, a bridge of 15 meters long was erected with this kind of “paper steel” and jeeps could be safely passed. In addition, use this