thE roCkEt EnginE, with its stEADy roAr likE thAt oF A wAtErFAll or A thunDErstorm, is An imprEssivE symBol oF thE nEw spACE AgE. roCkEt EnginEs hAvE {{u}} (76) {{/u}} powErFul Enough to shoot AstronAuts {{u}} (77) {{/u}} thE EArth’s grAvitAtionAl pull AnD {{u}} (78) {{/u}} thEm on thE moon. wE hAvE now BEComE {{u}} (79) {{/u}} in spACE. imprEssivE AnD ComplEx {{u}} (80) {{/u}} it mAy AppEAr, thE roCkEt, whiCh wAs {{u}} (81) {{/u}} inChinA ovEr 800 yEArs {{u}} (82) {{/u}} , is A rElAtivEly simplE DEviCE. FuEl thAt is {{u}} (83) {{/u}} in thE roCkEt EnginE ChAngEs {{u}} (84) {{/u}} gAs. thE hot AnD rApiDly {{u}} (85) {{/u}} gAs must EsCApE, But it CAn Do so only through An opEning thAt FACEs BACkwArD、As thE gAs is rADiAtED with grEAt ForCE, it pushEs thE roCkEt in thE oppositE DirECtion. |
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8%的考友选择了D选项
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