题目内容
为减小称量的相对误差，称量形式应具有较大的摩尔质量。
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为减小称量的相对误差，一般分析天平称量的试样质量应大于0.2 g。
滴定分析中，为减小测量的相对误差，应使滴定剂的体积在20 ~30 mL之间。
将21.37650、21.37651、21.37649、21.37551和21.37660修约成5位有效数字后，都是21.376。
Q: How did emojis develop? Why are emojis widely adopted?1. Prior to emojis:People had long used 1) _________________ – visual expressions strung together using symbols.2. Origin of emojis:Wireless carriers created sets of 2)_______________people could use in text messages in the late 1990s in Japan.3. Widespread of adoption of emojis:Facts• Apple adopted emojis on its operating system in 2011.• Android adopted emojis in 3) __________.ResultThe use of emojis quickly surpassed that of emoticons for two key reasons:Reason A: There’s a lot more that people can communicate with emojis.Reason B: Emojis became accessible and 4) _________.4. Current use of emojis:●In Britain: Eighty percent of smartphone users and almost 5) ___________ of smartphone users under 25 use emojis.●In America: Seventy-four percent of Americans use emojis every day.
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