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把经过烘干的过量的木炭粉和少量的氧化铜粉末混合均匀，小心地平铺在硬质试管底部，并将硬质试管固定在铁架台上，然后，用酒精喷灯加热，同时用导管将生成的气体导出． 请你对导出的气体成分进行猜想，并设计实验进行探究． （1）猜想：导出的气体可能是______（只写出一种猜想）； （2）实验操作______； （3）实验现象预测______； （4）根据你的探究结果，写出在探究过程中所发生反应的化学方程式：______↑，______．
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【简答题】建筑石膏浆体的终凝时间一般在(A. A、0.5
【简答题】阅读理解。 Mr and Mrs Green lived in a big city, and one summer they went to the country for their holiday. They enjoyed it very much because it was a quiet and clean place. One day they went for a walk ea...
【简答题】阅读理解。 Mr and Mrs Wilson lived in a big city, and one summer they went to the country for their vacation. They enjoyed it very much , because it was a quiet , clean place. One day they went for a walk ...
【单选题】Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it landed upside down in three feet of water. Mr. Johnson took the only escape route—throug...
A.
the ditch was along a quiet country road
B.
the accident happened on a clear warm day
C.
the police helped Mr. Johnson get out of the ditch
D.
Mr. Johnson had a tender wife and was well attended
【简答题】Mr. and Mrs. Green lived in a big city, and one summer they went to the country（农村）for their holiday. They enjoyed it very much, because it was a quiet, clean place. One day they went for a walk early...
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