15. 我国自主研发的“复兴号”CR300AF型动车组列车的最高运行速度为250000m/h,其中数据250000用科学记数法表示为 (C) A.$$ 2 5 \times 1 0 ^ { 4 } $$ B.$$ 2 . 5 \times 1 0 ^ { 4 } $$ C.$$ 2 . 5 \times 1 0 ^ { 5 } $$ D.$$ 2 . 5 \times 1 0 ^ { 6 } $...
//v3-dy.ixigua.com/cfee388420c4a25cf753112d7ed8baa3/67152f5d/video/tos/cn/tos-cn-ve-15/o8UBwekOwAf7G8fREuEIAPCGZBDLgd6kONkPTQ/?a=1556&ch=0&cr=0&dr=0&net=5&cd=0%7C0%7C0%7C0&cv=1&br=760&bt=760&cs=0&ds=3&ft=aTAJbQQqUuxfdoZPo0OW_QYaUqiX8McWoVJEa627MCPD-Ipz&mime...
//v3-dy.ixigua.com/b27c1cbe4cf8a118bd4a8b1ae10e2641/657d3218/video/tos/cn/tos-cn-ve-15/okBzAG5vDfxXqAoVIyhzAbNME3OGgnKUAC9Rwe/?a=1556&ch=0&cr=0&dr=0&net=5&cd=0%7C0%7C0%7C0&br=3129&bt=3129&cs=0&ds=3&ft=KaCilPPT2VNj96WM6BRfuLsORlM5Si_WKkN7TGbL&mime_type=video...