Ketenes, notably dimethyl ketene, readily undergo oligomerization and polymerization.烯酮, 特别是二甲基烯酮, 很容易齐聚和聚合.The purity of dimethyl disulfide was determined by capillary gas chromatography.应用毛细管气相色谱法测定二甲基二硫的纯度.Marine livi...
使用该方法冷镦凹模寿命低.The cold upsetting matrix's life is relatively short in this way.本文简要地介绍了我公司冷镦钢 ( SWRCH35K ) 的研制、开发情况以及生产工艺.The research development and technology of cold heading steel ( SWRCH 35 K ) are introduced.冷镦...