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有A、B、C、D、E、F六种物质的稀溶液，已知它们分别是K 2 CO 3 、BaCl 2 、Ca（NO 3 ） 2 、NaCl、H 2 SO 4 、AgNO 3 中的某一种溶液．下图为常温时上述溶液两两混合的部分实验现象， NO 3- Cl - SO 4 2- CO 3 2- Ba 2+ 溶 溶 不溶 不溶 Ca 2+ 溶 溶 不溶 Ag + 溶 不溶 不溶 其中“↓”表示生成沉淀，“↑”表示生成气体，“-”表示无明显现象或生成物．请回答下列问题： （1）在下图中的空格内用“↓”“↑”“-”表示出对应反应的实验现象． F是______．
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