While underbalance drilling spreads greatly, rotating blowout preventer, as a kind of high technical product, is the crucial equipment to control well pressure.
国内欠平衡钻井普遍实施,要用
转防喷器是关键设备,技术含量高。
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的故事 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.
细
——主要是细、
、真和原生动物——是许多疾传播的原因，这一认识大大加快了研究人员识别特定疾的因、预防方法和治疗方法的速度。
流阀前安装一个过滤器，防止由于止
防锈漆把底部刷一下。
