用硼砂标定盐酸溶液时,准确称取硼砂 0.7628g ,滴定时消耗盐酸 20.00 m l 至甲基橙由,计算盐酸的物质的量浓度( M 硼砂 =381.4g/mol , 反应的化学反应方程式为: Na 2 B 4 O 7 · 10H 2 O+2HCl= 4H 3 BO 3 +2NaCl+ 5H 2 O )
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【单选题】If you think a letter is too slow, why not try______a telegram?
【简答题】If you think a high-factor sunscreen ( 防晒霜 ) keeps you safe from harmful rays, you may be wrong. Research in this week’s Nature shows that while factor 50 reduces the number of melanomas ( 黑瘤 ) and de...
【简答题】阅读理解:If you think a high-factor sunscreen(防晒霜)keeps you safe from harmful rays, you may be wrongQuestion 1 to 5 are based on the following passage. If you think a high-factor sunscreen(防晒霜)keeps you s...
【简答题】Passage One If you think a high-factor sunscreen( 防晒霜 )keeps you safe from harmful rays, you may be wrong. Research in this week's Nature shows that while factor 50 reduces the number of melanomas( 黑瘤...