A:13
B:25
C:12
D:23
All of us have been to the park ____________________ because both of you are ill at home.
如图a、b、c三个实心小球,其中a与b质量相等,b与c体积相同;将三个小球放入水中静止不动时,a球漂浮、b球悬浮、c球沉底.则下列判断中正确的是( )