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。
During fracturing of low-temperature, shallow oil and gas reservoirs, it is difficult to break viscosity because of low activity of convention viscosity breaker at low temperature.
低温浅层油气井的压裂，常由于低温下常规破胶剂活性太低而破胶困难。
A low density cement slurry of zero thickening transition period which was appropriate to low temperature and shallow flow cementing operation in deepwater was introduced.
介绍了一种新型的用于海洋深水低温浅层流固井作业用的零稠化转化时间低密度水泥浆体系，该水泥浆体系采用新型高强快速凝固水泥制备。
In the front of the mountain area, circle alternate is intensive, the shallow geo-temperature gradient is on the low side.
在山前地区，与山区常温地下水循环交替强烈，浅部地温梯度明显偏低。
In the front of the mountain area, circle alternate is intensive, the shallow geo-temperature gradient is on the low side.
在山前地区，与山区常温地下水循环交替强烈，浅部地温梯度明显偏低。
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