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GF-4 Undergoes Test GF-4 is the first geosynchronous orbit Earth observation satellite with high resolution.The Beijing Institute of Control Engineering,CAST conducted a verification test for the complete satellite fuelling procedure,simulated the whole cycle of parallel propellant tanks filling of the propulsion subsystem.
GF-4 Undergoes Test GF-4 is the first geosynchronous orbit Earth observation satellite with high resolution. Beijing Institute of Control Engineering, CAST conducted a verification test for the complete satellite marking procedure, simulated the whole cycle of parallel propellant tanks filling of the propulsion subsystem.