管道用阻火器的适用范围及阻火原理是什么？（KHD：基础理论知识）_爱下问搜题

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问题问答题简答题

管道用阻火器的适用范围及阻火原理是什么？（KHD：基础理论知识）

答案

参考答案：

管道阻火器专用于加热炉的燃料气管道上，安装在燃料气进入喷嘴前的燃料气管道上，当喷嘴回火时，阻火器内的金属网由于器壁效应转化为热能使火焰熄灭，防止因回火而引起燃料气管道内爆炸的危险。

单项选择题

简单扩散是化学毒物的生物转运方式之一。而化学毒物的解离状态是其重要的影响因素。化学毒物处于解离型或非解离型的比例，取决于其本身的解离常数pKa和体液的pH，可以根据Henderson-Has selbach公式来计算：
有机酸：pKa-pH＝1g(非解离型HA/解离型A^-)
有机碱：pKa-pH=1g(解离型BH⁺/非解离型B)

苯甲酸pKa=4，如胃内pH=2，则苯甲酸在胃内的非解离型HA比例是

A．1%

B．100%

C．90%

D．99%

E．10%

完形填空

完形填空（每小题1.5分，共30分）
It was a normal summer night, humidity（潮湿）hung in the thick air. The only sound was my sister’s heavy __36__ from the bed next to me.
I couldn’t go to _37__, partly because of my cold and partly because of my __38__ for the next day. My mum had said that tomorrow was going to be a __39__ .
Sweat stuck to my aching body. Finally, I gathered enough __40__ to sit up. I looked out of my small window into the night. There was a big bright __41__ hanging in the sky, giving off a magic glow.
My sister turned over as though she was as light as air. Why could she sleep soundly? Why wasn’t she __42__ too? Did she know about tomorrow?
I couldn’t stand the __43__ anymore, so I did what I always do to make myself feel better. I went to the __44__ and picked up my toothbrush and toothpaste. Pouring the red paste onto the brush, I cleaned back and forth, up and down.
Then I walked downstairs to look for some __45__of movement, some life. Gladiator, my cat, __46__ me as he meowed（猫叫）his sad song. He was on the old orange couch （长沙发）, sitting up on his front legs, 47 something to happen. He looked at me as if to say, “I’m __48__, pet me. I need a good hug.” Even the couch begged me to sit on it.
In one movement I settled down onto the soft 49 . This couch represented my birth, my parents’ marriage, and hundreds of other little __50__.
As I held Gladiator, my heart started beating heavily. My mind was __51__ with questions: What’s life? Am I really alive? Are you listening to me? Every time I moved my hand down Gladiator’s body, I had a __52__ thought; each touch sang a different song.
I forgot all about the __53__ and the next day’s surprise. The __54__ was so full of warmth and silence that I sank into its arms. Falling asleep with the big cat in my arms, I felt all my worries __55__ move away.

A．interpretations

C．arrangements

D．expectations

A．sitting-room

D．waiting-room

A．begging for

C．admiring for

D．waiting for