7/3,4/2/4/5/5,6/4/3/4,6/1,2,6,7/O점:ㅂ,B점:ㄹ/100ms/주기:2초,진동수:0.5Hz/4점,줄을놓을때해머는원의접선방향으로날아가기때문/A:속력만변함B:모두변함
당신은 어느 그룹입니까?