Moreover, the double-effect absorption refrigeration system is also investigated .
同时也分析了直燃型双效制冷系统。
The process flow of steam absorption refrigerating set and double-effect lithium bromide absorption refrigerating set were introduced.
介绍了常用的蒸汽吸收式制冷机组、双效溴化锂吸收式制冷机的工艺流程。
Another experiment demonstrated that physical exercise, which was sufficiently vigorous to double the rate of breathing, had no effect on the frequency of yawning.
另一项实验表明，体育运动——尤其是剧烈的运动——可以使呼吸频率增加一倍，但这对打哈欠的频率没有影响。
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