题型:问答题 简答题 甲、乙两弹簧振子,振动图象如图所示,则可知 [ ]A.两弹簧振子完全相同 B.两弹簧振子所受回复力最大值之比F甲∶F乙=2∶1 C.振子甲速度为零时,振子乙速度最大 D.振子的振动频率之比f甲∶f乙=1∶2 查看答案
题型:问答题 简答题 —Mum, would you please buy me an MP5 player?—If you can help do the dishes the whole vacation, you ________ have one as a reward.A.mustB.needC.wouldD.shall 查看答案