如图表示了力的作用效果,其中图(a)主要表示力能使物体 ;图(b)表示力能使物体 。
改变运动状态 发生形变
组成并接体
A.SnRNAB.hnRNAC.45s-rRNAD.53-rRNAE.mRNA
His house was burnt________the ground due to the big fire, ________ made him homeless.