In 2012, Jiaolong manned submersible made a 7000 meter sea trial. Before that, only the US, France and Russia had manned deep submarines in the world.
In 2012, Jiaolong manned submersible made a 7000 meter sea trial. Before that, only the US, France and Russia had manned deep submarines in the world.
A.正确
B.错误
正确答案：B
Tag：向世界讲述中国
时间：2021-05-19 15:10:15
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