27.(14分)(1)除去碎铁屑表面的油污(2分)(2)防止过滤时FeSO4品体析出损耗,影响产率(2分)(3)蒸发皿、玻璃棒(2分)(4)>,(1分)FSO47H2O消耗了较多的O2,①中体积减小更多,活塞向右移动距离大。(2分)(5)大于(1分)(6)0.3V(2分)(7)AB(2分)

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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