A preheated engine can be started directly on HFO provided that the external fuel system has the correct temperature and pressure.
且当外部燃油系统供给的柴油达到要求的温度及压力时，预热发动机就可以被启动。
It is convenient and economical For HFO-1234yf if this refrigerant can substitute HFC-134a directly and in a way not to change MAC system.
我认为如果能直接替换hfc- 134a，不要更换空调系统，这是很方便和经济的。
It is convenient and economical For HFO-1234yf if this refrigerant can substitute HFC-134a directly and in a way not to change MAC system.
我认为如果能直接替换hfc- 134a，不要更换空调系统，这是很方便和经济的。
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