Objective:To evaluate the long-term outcome of mitral valve replacement with giant heart under shallow low temperature cardiopulmonary bypass in beating heart.
目的：评价在浅低温体外循环心脏跳动中巨大心脏病人二尖瓣置换术的远期疗效。
The primal problem in low temperature and shallow gas reservoirs is to overcome the break, the flowing back, and the damage of the fracturing fluids.
对埋藏浅、储层温度低的油气藏进行压裂改造，需要解决压裂液低温破胶、快速返排和伤害问题。
Long cementing section and low well temperature are main features of well-cementing of shallow gas zone.
水泥封固段长、井温低，是浅层气固井的主要特点。
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