In 2012, Jiaolong manned submersible made a 7000 meter sea trial. Before that, only the US, France a
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In2012,Jiaolongmannedsubmersiblemadea7000meterseatrial.Beforethat,onlytheUS,Francea
题目：日记笔In2012,Jiaolongmannedsubmersiblemadea7000meterseatrial.Beforethat,onlytheUS,FranceandRussiahadmanneddeepsubmarinesintheworld.：参考答案：错
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