Reduce the informality of this sentence, and re-write the new sentence in the box.Q8: There isn’t very much research on the use of oil palm shell as coarse aggregate in the production of concrete.
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【简答题】(14分)实验室常用邻苯二甲酸氢钾(KHC 8 H 4 O 4 )来标定氢氧化钠溶液的浓度,反应如下:KHC 8 H 4 O 4 +NaOH=KNaC 8 H 4 O 4 +H 2 O。邻苯二甲酸氢钾溶液呈酸性,滴定到达终点时,溶液的pH约为9.1。 (1)为标定NaOH溶液的浓度,准确称取一定质量的邻苯二甲酸氢钾(KHC 8 H 4 O 4 )加入250mL锥形瓶中,加入适量蒸馏水溶解,应选用_...