X 线管具有高度的真空能够
更新时间:2024-11-15 21:22:51 A、防止吸收软X线C
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重写句子：WelivedinasmalltownwhenIwasasmallchild.WemovedtoShanghailater.Myfatherlandedabetterjobthere.(compound-complexsentence)
Agriclturalchangesinthelate18thandearly19thcenturiesinEnglandweresogreatthattheywereworthyoftheterm“________”.
Becauseofthebadweather,thesportsmeethadtobe________.
Britainhas,forcenturies,beenslowlytiltingwith________.
支持代孕的理由有
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