底面积为400cm2的圆柱形容器内装有适量的水,将其竖直放在水平桌面上,把边长为10cm的正方体木块A放入水后,再在木块A的上方放一物体B,物体B恰好没入水中,如图(a)所示。已知物体B的密度为6×103kg/m3,质量为0.6kg。(取g=10N/kg)
根据图A和图B回答问题:
____ ____a boy and a girl in the classroom.
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