问题题干答案解析相关问题热门问题最新问题

问题详情

下列几个关于功的说法中正确的是______。 (20)

A、静摩擦力也可以做功

B、作用力的功一定等于反作用力的功

C、滑动摩擦力只能做负功

D、负功表示功投影到坐标轴的负方向

时间：2021-09-08 14:15 关键词：青书学堂河北建筑工程学院普通物理（高起专）

答案解析

A

相关问题

boost的意思是:help or encourage to increase or improve
eloquent的意思是:fluent or persuasive in speaking or writing
You should _______________ to one or more weekly magazines such as Time or Newsweek.
_____ed ucation is the instruction that occurs when the instructor and studen t s are separated by distance or time,or both.
No more having to buy expensive textbooks which you will only use for a year or two and then sell or _______ away.