The existence and producing conditions of non-isoentropy flow and non-isoentropy wave have been argumented in classical gas dynamics.
在经典气动力学中讨论了非等熵流和非等熵波的存在和产生的条件。
They are as compact as classical gas heaters that only produce heat. Moreover, they can comfortably be mounted on the wall and easily be maintained.
这种设备不仅和传统的单纯气体加热设备一样紧凑，而且可以简单的安装在墙上，维护起来还很容易。
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