嫦娥二号月球探测卫星由长征三号丙运载火箭成功发射完成嫦娥二号任务首先要突破用长征三号丙火箭将嫦娥二号直接送入地月转移轨道。采用这种方式不仅大大缩短了嫦娥二号的飞行时间,而且减少了嫦娥二号的燃料消耗。不过,嫦娥二号采用的这种直飞方式对运载火箭的发射窗口要求更严了,推力要求更大了,入轨精度和控制精度要求更高了。(秦宪安摄) Chang’e II lunar exploration satellite launched by the Long March III C carrier rocket to complete the task of Chang’e 2 first breakthrough with the Long March III C rocket will be sent directly to the Chang’e II on Earth orbit transfer. Using this approach not only greatly reduces the Chang’e II flight time, but also reduces the Chang’e II fuel consumption. However, Chang’e II uses this direct mode of launch launcher launch window more stringent requirements greater thrust, orbital accuracy and control accuracy requirements higher. (Qin Xiangan photo)