用10N的水平拉力拉着重为60N的小车在水平路面上前进3.5m,拉力做的功为 _________ J,重力对小车做的功是_________J.
35;0
Get up early and do exercise every day, _______ you won't have a strong body.[ ]
A. but
B. for
C. and
D. or
不属椎间盘的组成部分是()
A.前纵韧带
B.上软骨板
C.下软骨板
D.纤维环
E.髓核