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单词 payload assist module
释义

WordReference Random House Unabridged Dictionary of American English © 2024
payload assist mod′ule, 
  1. Rocketry, Aerospacea U.S. solid-propellant rocket used to boost a medium-weight spacecraft from a circular low-earth orbit to an elliptical transfer orbit for later insertion into a geosynchronous orbit. Abbr.: PAM Cf. inertial upper stage. 
  • 1980–85

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