小球从高为h处以初速度v0落下，撞击地面后反弹，回到出发点处速度大小仍为v0.在此过程中小球与地球组成的系统的()
Agoodworkerinakeyspotcould,hekeptupproduction,takeallthecoffeebreakshewanted,andthebosseswouldverylikelylooktheotherway.
We_____knowledgefromourfamilies,schools,jobs,andthemassmedia
二次大战后资本进一步国际化的突出特点是()
Thetheoryofblackholesinspace__(accept)bymanyseriousscientistsandastronomers.
