Nuclear rockets, in contrast to their chemical 17）________, could impart a maximum speed of up to about 22 kilometers a second.
举一反三
- Nuclear rockets, in contrast to their chemical
- What is the maximum speed Titanic could reach?
- High-speed trains travel at 300 kilometers an hour, which is about __________ normal trains. A: four times the speed as B: the speed four times of C: four times as the speed of D: four times the speed of
- The teacher told us the light _________________ (travel) at 300,000 kilometers a second.
- Over 100,000 chemical reactions _____ the brain every second.