[填空题]
A space vehicle returning from the Moon enteejzb)i 1h33wcgt,:: n,zbay br6v e,6n zrfuqq y2cg1c +)-t -pyxh6wjs Earth’s atmosphere at a speed of about 40,000 km/h Molecules (assume nitrogen) striking the nose of the vehicle with this speed correspond top y-)c gu-cn2,q+ yr6xez61 jq6thfwv what temperature? (Because of this high temperature, the nose of a space vehicle must be made of special materials; indeed, part of it does vaporize, and this is seen as a bright blaze upon reentry.) K
