{"source":{"id":"2111067037363810420","title":"软铜怎么在花岗岩上钻出平整圆孔？ 根本钻不动。 只要硬碰硬敲下去，铜凿子立刻就会卷刃。 花岗岩里全是石英晶体，莫氏硬度高…","url":"https://mubeitech.com/p/2111067037363810420"},"method":"semantic-similarity","count":0,"items":[]}