It is cheap that R290 has the good and economic.
R290价格低廉，具有良好的经济性。
The combustibility of R290 can completely control its safety.
R290的可燃性在实际中是完全可以控制其安全性。
The thesis studied the situation of performance matching for natural refrigerant propane (R290) instead of R22 in minitype room air conditioners.
本文研究了自然工质丙烷(R290)替代r 22在小型家用空调的性能匹配情况。
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