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【简答题】
酸碱滴定中指示剂的选择决定定的突跃范围,被滴定的酸(碱)越弱,滴定的突跃范围越 (大或小);酸碱浓度越大,滴定的突跃范围越 ( 大或小)。有0.10mol/L的HCN溶液, 已知其Ka=6.2×10 -10 ,则该溶液 (能、否)用标准碱溶液直接准确滴定。
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举一反三
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【简答题】A — on a day-to-day basis J — intelt hotels B — total room revenue K — high season C — hotel service information L — no vacancies D — group rate M — night...
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