Riding a bike is exercise. Walking is exercise. Running is exercise. Playing pingpong is exercise. I exercise every day. I walk to school from Monday to Friday. After class, I play sports with my friends. After school, I run
p1(Mpa)
p2(Mpa)
400℃
99.6
99.7
500℃
96.9
97.8
下列词语中划线的字,每对读音全不相同的一组是( )
2003年10月15日9时,由中国自行研制的“神舟五号”飞船载着中国自己培养的宇航员杨利伟升入太空,并在太空遨游21小时,实现了中国几代人的梦想,请问下列哪项不是宇航员必须携带的维持生命的物质( )