A method for determining the hexagonal polytypes of silicon carbide using the Laue pattern is described.本文提出了用X射线 劳埃法鉴定SiC六方多型体类型的方法.For the materials with high hardness, such as cemented carbide, glass , jadeware, etc.适...
We are out of toothpicks. Please give me a pack.我们的牙签用完了, 请给我一盒.Need toothpicks to keep your eyes open at work?在工作上需要用牙签来撑开眼睛?David: Where are the toothpicks?戴维: 牙签在哪里?...