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Dreschel head ÊÇʲô¶«Î÷? ÔÚÎÄÏ×ÖÐÔ¾äΪ"Three 50-ml round-bottomed flasks were used in this procedure, named in order as flask (1), flask (2) and flask(3). They were connected with glass tubes and Dreschel heads. One gram of AC was placed in flask (2) and covered with distilled water." лл! |
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