And they were very important to the environmental control systems in the spacecraft.
并且他们对太空船的环境控制系统而言是相当重要的。
Sewage source heat pump systems are environmental protection, high efficiency and energy saving.
污水源热泵是高效的环保节能系统。
Sewage source heat pump systems are environmental protection, high efficiency and energy saving.
污水源热泵是高效的环保节能系统。
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