What will the woman do this afternoon?
A:Do some exercise.
B:Go shopping.
C:Wash her clothes.
关于海冰和冰山的描述错误的是( )
做“观察水的沸腾”实验时:
甲:b﹣a<0
乙:a+b>0
丙:|a|<|b|
丁: ba >0
其中正确的是( )