与其他法律规范相比,统计法具有()特点
A.调整对象具有特殊性
B.调整对象具有普遍性
C.调整对象具有复杂性
D.规范内容具有专业性
E.规范内容具有公共性
参考答案:A, C, D
Last year, a certain public transportation system sold an average (arithmetic mean) of 41,000 tickets per day on weekdays (Monday through Friday) and an average of 18,000 tickets per day on Saturday and Sunday. Which of the following is closest to the total number of tickets sold last year ?()
A.1 million
B.1.25 million
C.10 million
D.12.5 million
E.125 million
如图所示,有一金属棒ab,质量m=40g,电阻R=2.8Ω,可以无摩擦地在两条轨道上滑动,轨道间的距离d=20cm,电阻不计,轨道平面与水平面间的夹角α=37,置于竖直向上的匀强磁场中,回路中电池的电动势E=2v,内电阻r=0.2Ω,问磁感应强度B为多大时,金属棒恰好静止?(sin37=0.6,cos37=0.8,g取10m/s)