动车从福安开到福州115km,所用时间30min,求动车平均速度多大?
30min=0.5h
v=st=115Km0.5h=230km/h
答:动车平均速度230km/h.
The international network of fuel export proposed by Russia will enhance the efforts of nuclear non-proliferation. True False
碱耗使用的单位是()。