有一薄转盘,质量为 m ,经平衡试验测定其质心偏距为 ,图垂直向下。由于该回转面不允许安装平衡质量,只能在平面I、II上校正。已知: m =10Kg , r =5mm , a =20mm , b =40mm ,则在I基面上的平衡积的大小和( ),II基面上的为( ) A.基面I上平衡积0.1Kgm,方向向上 B.基面I上平衡积0.1Kgm,方向向下 C.基面II上平衡积0.05Kgm,方向向上 D.基面II上平衡积0.05Kgm,方向向下
A.
AC
B.
BD
C.
AD
D.
BC
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