词汇运用(共10小题;每小题1分,满分10分)根据汉语提示,在句中横线上填入适当的单词或词组(每空限填一词)。【小题1】Taiwan is one part of our countr
书写下列反应的方程式:(1)乙醇与金属钠反应: (2)乙醇的催化氧化:
-Good news! Metro Line 11will be open on June 30in our city. -Great! It will make our lives more convenient. A.richer B.easier C.faster
将18.2gMg、Al、Fe组成的合金溶于足量的NaOH溶液中,可产生0.3mol气体。另取等质量合金溶于过量稀硝酸中,生成NO气体,向反应后的溶液中加入NaOH溶液恰
( )The old professor told us that every part of the materials should be made use of _________the station. A. building B. to build C. build D. being build
已知丙酮是无色液体,易溶于水,密度小于水,沸点为55℃。要把丙酮从水与丙酮的混合物中分离出来,下列方法最合理的是 ( ) A.蒸馏