By a combination of theoretical analysis and performance testing, it is shown that refrigerant mixture R407C is a drop-in substitute for R22 in inverter heat pump air-conditioners.
通过理论分析及空调器整机性能试验， 说明混合工质R407C是变频冷暖空调器中R22 的灌注式替代工质。
Appropriately designed drop-in fuels can substitute for diesel and aviation fuel, which ethanol cannot.
适合的设计的dropin燃料能够够替代柴油和航空用油，乙醇是做不到这点的。
Appropriately designed drop-in fuels can substitute for diesel and aviation fuel, which ethanol cannot.
适合的设计的dropin燃料能够够替代柴油和航空用油，乙醇是做不到这点的。
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