例句與造句

1. The pulsed rocket motor is made by pouring each segment of propellant separately.
2. Also, pulsed rocket motors that burn in segments and that can be ignited upon command are available.
3. These could have included multi-pulse rocket motors, thrust vectoring, hybrid rockets, gel propellants, and ductless external combustion ramjets.
4. The benefit of the pulse rocket motor is that by the command ignition of the subsequent pulses, near optimal energy management of the propellant burn can be accomplished.
5. It's difficult to find pulsed rocket motors in a sentence. 用pulsed rocket motors造句挺難的