【正确答案】 China's manned space engineering project follows a "three-step" strategic plan. The first step is to send Chinese astronauts into space, conduct multi-day and multi-manned space flight with safe return to the preset position. The second step is to make a breakthrough in the key technology of carrying out extravehicular activity, send space station into space, and perform short-term manned space applicable experiment. The third step is to build a permanent space laboratory that allows astronauts to conduct long-term manned space applicable experiment.