摘要
On April 19,the first test firing of the power system for the LM-7 first stage achieved a complete success.The LM-7 launch vehicle completed kerosene loading,liquid oxygen loading,engine vacuum pumping,prelaunch pressurization and engine ignition according to the preset workflow,and cutoff after 188 seconds of
On April 19, the first test firing of the power systemfor the LM-7 first stage complete suc-cess. The LM-7 lauch Vehicle completed kero-scne loading liquid oxygen loading engine vacuum pump-ing
