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inertial upper stage

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noun
a U.S. two-stage, solid-propellant rocket used to boost a relatively heavy spacecraft from a low earth orbit into a planetary trajectory or an elliptical transfer orbit. Abbreviation: IUS
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SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE?
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Question 1 of 6
Which form is used to state an obligation or duty someone has?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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