下列各有关的叙述，反映物质的物理性质的是请选择ABvCD0E6l7?'?/U,L+^,l3P+O6P:`1B9R
A．加油站内严禁烟火，严禁接打手机'?/U,L+^,l3P+O6P:`1B9R
B．相同条件下，铁的密度比镁的密度大'?/U,L+^,l3P+O6P:`1B9R
C．在潮湿的空气中镁易生锈'?/U,L+^,l3P+O6P:`1B9R
D．绿色的碱式碳酸铜受热变成黑色'?/U,L+^,l3P+O6P:`1B9R