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A:He is ill.
B:He is a worker.
C:He likes doing kung fu.
某种温度下,在100g质量分数为20%的硝酸钾不饱和溶液甲中加入10g硝酸钾固体,恰好得到饱和溶液乙,下列说法正确的是( )
若函数f(x)=(a﹣1)x在(﹣∞,+∞)上单调递增,则实数a的取值范围是____.