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某结晶水合物的化学式为A•XH2O,其式量为B,在60℃时m g该晶体溶于n g水中,得到V mL密度为d g•mL-1的饱和溶液,下述表达式判断正确的是( )A. 该溶液物质的量浓度为1000(B-18X)BVmol•L