问题 问答题 简答题

简述黄药、醚醇的性质和作用机理。

答案

参考答案:

黄药是由醇、苛性钠及二硫化碳三种原料相互作用制得的,为黄色固体粉末,有刺激性臭味,易氧化,易溶于水,易分解,它对碱土金属的硫化矿中脉石无捕收作用,可与重金属、贵金属离子生成难溶性化合物,当硫化矿表面被经微氧化的,表面金属离子与黄药离子作用,提高硫化矿物的疏水性。

醚醇是由石油裂化产生的丙稀成份经氯化、皂化缩合而成,水溶性好,泡沫不粘,消泡快,醚醇属于异极性物质,吸附在气泡表面阻碍或减轻气泡的相互兼并降低气泡有的上升速度,影响气泡的大小和分散状态,起到稳定泡沫的作用。

选择题
完形填空
The young couple had another quarrel. They were sitting silently when the landlady came in and asked, “You don’t   31  the house any more?” He kept silent and she   32  shook her head.
The landlady began   33  the house. After looking around, the landlady screamed, “See how you have   34  my house? The walls are full of nails! How could I rent it to others?”
She began looking around her   35 room. Four years ago on the wedding night, he felt deeply   36  to her, saying, “I feel so sorry to you for   37  you live in this small room. In the future I will buy our own big house.”
This tiny room has two nails on the wall next to the door, one for her bag and the other   38  . At that time, she threw all her stuff such as her bag and umbrella on the   39  once she entered the room, staring at the whole   40  and feeling terribly upset. Then he began   41  more nails into the wall. There were three nails on the left, on which   42  his clothes yesterday and four on the right used to   43  their wedding photo frame.
The landlady started to pull the nails out with a tool. After the nails were   44 , the walls were left with countless holes. Suddenly, she felt heartbroken as if she were   45  nonstop through these holes.
  She   46  to her feet and exclaimed, “Stop removing the nails! We will rent the house   47  we buy our own!” He gazed at her surprised, and then turned round, tears over his cheek.
She   48 realized that marriage was like a wall and that all   49  and “cold wars” were like the nails on the wall.  50 , when they were removed, only a wall with holes would remain. But if all the nails were still in their own places, the wall was still complete and reliable.
小题1:
A.likeB.cleanC.rentD.keep
小题2:
A.simplyB.barelyC.coldlyD.proudly
小题3:
A.observingB.examiningC.watchingD.spotting
小题4:
A.sharedB.ruinedC.keptD.decorated
小题5:
A.familiarB.dirtyC.emptyD.bright
小题6:
A.devotedB.attachedC.optimisticD.guilty
小题7:
A.leavingB.havingC.askingD.getting
小题8:
A.clothesB.picturesC.umbrellasD.hats
小题9:
A.floorB.wallC.ceilingD.door
小题10:
A.troubleB.messC.confusionD.order
小题11:
A.puttingB.strikingC.drivingD.beating
小题12:
A.hungB.fastenedC.droppedD.swung
小题13:
A.connectB.fixC.hangD.put
小题14:
A.replacedB.separatedC.unfastenedD.removed
小题15:
A.cryingB.achingC.bleedingD.disturbing
小题16:
A.jumpedB.heldC.stuckD.got
小题17:
A.ifB.unlessC.asD.until
小题18:
A.especiallyB.eventuallyC.fortunatelyD.sadly
小题19:
A.chaosB.troublesC.quarrelsD.challenges
小题20:
A.ThereforeB.BesidesC.ThusD.However