While underbalance drilling spreads greatly, rotating blowout preventer, as a kind of high technical product, is the crucial equipment to control well pressure.
国
平衡钻井普遍实施,要用到的旋转防喷器是关键设备,技术含量高。
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事 The understanding that germs — primarily bacteria, viruses, fungi, and protozoa — are responsible for the spread of many diseases led to a massive acceleration in researchers identifying specific disease causes, preventers, and treatments.
——主要
、病毒、真和原生动物——许多疾病传播
原因，这一认识大大加快了研究人员识别特定疾病病因、预防方法和治疗方法速度。
流阀前安装一个过滤器，防止由于止
期间产生泄漏或溢出。
