single-stage compression ratio
... 单级旋片式真空泵 single stage rotating blade vacuum pump 单级压缩比 single-stage compression ratio 单晶 single crystal ...
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single-stage compression ratio
单级压缩比
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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But there are some shortage of ordinary single-stage heat pump in low-temperature environment, such as high compression ratio, devoid heating power and low efficiency.
但普通单级空气源热泵热水器在低温环境下运行中存在压缩比过大、制热量不足和制热效率太低等问题。
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