CH4氯化反应有什么特点？

搜题请搜索小程序“爱下问搜题”

问题问答题简答题

CH4氯化反应有什么特点？

答案

参考答案：

要使氯化反应能顺利进行，氯与甲烷必须进行充分混合，以避免局部过高，同时温度分布需保持均匀，不使有局部过热现象发生。甲烷热氯化反应温度较高（400摄氏度左右）反应过程中不仅有大量热量放出，且有大量强度腐蚀性氯化氢气体产生。反应器材质必须能耐酸。工业上是采用绝热式反应器，反应释放的热量是由大量过量的甲烷带出。

完形填空

Once I went to a railway station near New York. I 36 to take the night train there. 37 of people were pushing into the 38 train. I found a railway official and asked him if I could get a place in a sleeping car, 39 he said sharply, “No, you can’t. The train is full. Don’t 40 me any more.”
I was very 41 indeed. I said to the friend who was with me, “ he talked to me like this 42 he doesn’t know that I am a famous writer. If he knew…But before I could 43 my sentence my friend said, “Don’t be 44 . How could that help you? Whoever you are, there are no 45 seats on the train.” I was 46 he was wrong, so I went up to the same official again and told him that I was Mark Twain. But all he said, “I told you not to trouble me any more.”
Just then I 47 a young porter in a sleeping car looking at me, He whispered something to the train conductor, and that conductor came over to me and said very 48 , “ Can I help you, sir?” “ I 49 do.” I answered.
The porter took out boxes and we got on to the train. When the porter saw we were comfortably 50 in our places, he said, “Now. Is there anything you want, sir? Because you can have whatever you 51 .”
After the porter had gone, my friend looked 52 . He said. “I am 53 sorry I said those things to you just now…” Just then the porter came again and said. “ Oh. Sir, I 54 you immediately”. “Really?” I said happily, “of course”, he said. “I recognized you the 55 I saw you and told the conductor that you are Mr Smith, the mayor of New York City.”

查看答案

问答题

阅读以下说明和C代码，将应填入(n)处的字句写在对应栏内。
【说明】
在一图像处理系统中，开发者定义了一个图像结构ImageCon，其中定义了图像应该具有的属性。当图像件的内容或状态发生变化时，与之相关联的ImageView结构的值都需要发生改变。一个ImageCon结构能够关联一组ImageView结构。当ImageCon结构的内容或状态发生变化时，所有与之相关联的ImageView结构都将被更新，这种应用被称为观察者模式。以下代码采用C语言实现，能够正确编译通过。
【C代码】
#include ＜stdio.h＞
#define OBS_MAXNUM 20/*一个ImageCon变量最多能够关联的ImageView变量的个数*/
typedef void (1) (struc ImageCon *，struct ImageView *)；
struct ImageView{
func update； /*ImageView结构采用的更新函数*/
/*其他的结构字段省略*/
}；
struct ImageCon{
(2) myObs[OBS_MAXNUM]；
/*存储所有与ImageCon相关联的ImageView结构指针*/
intindex； /*与ImageCon结构变量相关联的ImageView结构变量的个数*/
}；
void attach(struct ImageCon *IMG，struct ImageView *ob){
/*关联Obersver结构ob与ImageCon结构IMG*/
int loop=0；
if(IMG→index＞=OBS_MAXNUM||ob==NULL)return；
for(loop=0；loop＜IMG→index；loop++)
if(IMG→myObs [loop]= =ob)return；
IMG→myObs[IMG→index]=ob；
IMG→index++；
}
void detach(struct ImageCon *IMG，struct ImageView *ob){
/*解除IMG结构与ob结构间的关系*/
int loop；
if(ob= =NULL)return；
for(loop=0；loop＜IMG→index；loop++){
if(IMG→myObs[loop]= =ob){
if(loop＜=IMG→index-2)
IMG→myObs[loop]=IMG→myObs[ (3) ]；
IMG→myObs[IMG→index-1]=NULL；
IMG→index- -；
breack；
}
}
}
void updatel(struct ImageCon *IMG，struct ImageView *ob){
/*更新ob结构的值，更新代码省略*/
}
void update2(struct ImageCon *IMG，struct ImageView *ob){
/*更新ob结构的值，更新代码省略*/
}
void notifyObs(struct ImageCon *IMG){
/*当IMG结构的值发生变化时，通知与之关联的所有ImageView结构变量*/
int loop；
for(loop=0；loop＜IMG→index；loop++){
(IMG→myObs[loop])→update (4) ；
}
}
void main(){
struct ImageCon IMG；/*定义一ImageCon变量*/
struct ImageView explorer1，explorer2；/*定义两个ImageView变量*/
/*初始化与ImageCon变量相关的ImageView变量个数为0*/
IMG.index=0；
explorer1.update=updatel；/*设置explorerl变量的更新函数*/
explorer2.update=update2；/*设置explorer2变量的更新函数*/
attach(&IMG，&explorer1)；/*关联explorer1与IMG对象*/
attach(&IMG，&explorer1)；/*关联explorer1与IMG对象*/
/*其他代码省略*/
(5) ；
return；
}

查看答案