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Each evacuated tube consists of two layers of glass tubes.
每个真空管组成,两层玻璃管道的情况.
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Instantaneous efficiency curves for both single evacuated tube and complete evacuated tubular collector are also tested.
通过实验,还分别测定了单根真空管和真空管集热器的瞬时效率曲线.
The feasibility of ETT ( Evacuated Tube Transportation ) has been verified by foreign and domestic experts.
真空管道运输的可行性已经得到国内外专家的论证.
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