【填空题】
1．“长征五号”运载火箭采用液氢液氧作推进剂。液氢温度为零下253 ℃，记作___，液氧温度为零下183 ℃，记作___。火箭发射时尾部火焰温度达到3000 ℃，记作___。
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答案
－253 ℃|－183 ℃|＋3000 ℃
解析
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