对成人进行胸外按压时，压到()后立即全部放松，使胸部恢复正常位置让血液流进心脏
C
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Culturaladaptationisabout;
Whatisthemainadvantageofradioads:（）
Oursisbeautifulschoolwithalonghistory,____weareproud.
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The( )ofyellowandblueformgreen.