1.4 实验:用打点计时器测速度
答案:
1.交流,3-6,220,电火花计时器,0.02
2.ABD 3.ABC 4.B 5.CD. 6. BC 7.BCD
8.交流, 0.02(n-1),BAEDCF
9.偏小 10.加速,0.304m/s,0.252m/s