道路运输继续教育 2021_08_12 每日一练
Flying across the ocean and far into the space has mainly brought people ________.
A、service, convenience and information
B、fun, enjoyment and experience
C、nearer to the far-away planets
D、nearer to the moon and mars ion.
某公司有两艘船舶:A船定额吨位1万吨,B船定额吨位2万吨。该月A船航行25天,航行5000海里;B船航行20天,航行6000海里。则两船的平均航行速度是( )海里/天。
A.200
Β.250
C. 261.54
D. 266.67