A:Excuse me
B:Good luck
C:Thank you
D:Don’t worry
他性格豪放,热爱中国山河,游踪遍及南北各地,写出大量赞美名山大川的壮丽诗篇。人称“诗仙”。“他”是唐代诗人( )
look forward to, accuse sb. of sth., be eager to, inform sb. of sth., concentrate on, so as to, demand to, depend on, assist sb. with sth. ahead of
关于摩擦力,下列说法正确的是( )