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【单选题】
金属钠放在水中浮在水面上,放在煤油中沉在油层下,煤油的密度是0 . 8 g·cm -3 ,推测钠的密度(g·cm -3 ) [ ]
A.
大于1 . 0 g·cm -3
B.
小于0 . 8 g·cm -3
C.
介于0 . 8~1 . 0 g·cm -3 之间
D.
不能确定
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