问题
选择题
“I don’t think it’s my _____ that the TV blew up. I just turned it on, that’s all,” said the boy.
A．matter
B．mistake
C．fault
D．duty
答案
答案：C
搜题请搜索小程序“爱下问搜题”
“I don’t think it’s my _____ that the TV blew up. I just turned it on, that’s all,” said the boy.
A．matter
B．mistake
C．fault
D．duty
答案：C
求出(3)若保持小车及车中的砝码质量M—定，探究加速度a与所受外力F的关系，由于操作不当.得到的a-F关系图象如图所示.其原因是:__________________。