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。
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.
分析了传统的远程机器人监视系统，针对其视频压缩、数据传输两方面的不足，提出了两个改进方案。
This paper analyses the traditional remote robot monitoring system. According to the shortages on video compressing and data transferring, two improvements are proposed.
分析了同类产品在现场应用中的众多不足，结合新型压缩原理而研制了该产品。
Analyzed the former of the same kind product on the spot applied inside numerous lack, combinative new compression principle to research and manufactured he product.
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