Jasminum sambac Air has high development and used value.茉莉花植物具有很高的开发利用价值.Objective : To study the effect of Jasminum nudiflorum Lindl water extraction on anti - hypoxia.目的: 研究迎春花茎叶提取液耐缺氧作用....
综述了石油钻杆接头失效的十一种主要形式.Eleven mare modes of tool joint failures are summarized.那个钻杆的丝扣坏了, 换另外一根.That pipe thread is bad. Use another one instead.本文还介绍了微型钻杆测试系统压力瞬时分析方法.A systematic pressure transient analysis method for min...