在老师的指导下,他们还测定出水样中含有氮、磷、钠等,这里的氮、磷、钠是指请选择DCBA5h;K:s3u.X2M0g)}4R6Y(M,G0Z7f;}4A2M6r'?0v
A.元素,G0Z7f;}4A2M6r'?0v
B.分子,G0Z7f;}4A2M6r'?0v
C.原子,G0Z7f;}4A2M6r'?0v
D.单质,G0Z7f;}4A2M6r'?0v