下列关于气体燃料的火炬燃烧说法错误的是( )。 A．由于气体_爱下问搜题

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问题单项选择题

下列关于气体燃料的火炬燃烧说法错误的是( )。

A．由于气体燃料与空气分别送入燃烧室，燃烧室同时具有混合和燃烧功能，但混合过程远较燃烧过程缓慢，因此燃烧速度和燃尽程度就取决于燃气和空气的混合速度和混合的均匀程度
B．燃气和空气的混合过程主要靠强制混合进行，因此混合速度较快，混合过程需要较大的空间，燃烧室的容积热强度较低
C．由于混合速度较慢，火炬会拉得很长，又因为是发光火焰，在燃烧的同时还要进行热交换，因而火炬的温度不高；反过来又影响燃烧反应速度的减缓
D．火炬燃烧时，燃气和空气混合过程的强烈程度对燃烧室的空气动力特性和炉子的经济性有很大影响

答案

参考答案：B

完形填空

The young boy and his father sat quietly watching the snow fall on a snowy Saturday afternoon.
“Dad, my friend told me that every snowflake is 36   . But they look all the same to me. How can we tell?” the child asked.
Dad felt it was his 37 to give a more satisfying answer. “Son, snowflakes are like people. We are each   38 in a very special way. We can test it right now,” he said.
The child stood up, put out his hands, and 39 as snowflakes landed on his gloves. “These snowflakes are all different on my gloves, but those in the yard look the same. Together they are even more_ 40 and striking. Then if people are like snowflakes, why don't they    41 ?”
“Choice,”Dad said. "Their choices 42 them what they are.”
“ 43 choice is a bad thing?” the boy asked.
“Oh, no. Only when we choose the 44 things.”
“How do we tell right from wrong?" the child asked.
Dad was given the chance to build upon the foundation of his son's 45 . He reached down and began to 46 with the snow. He 47 the snow into two sides, three large snowballs on one side and several smaller ones on the other.
“Which side did the right thing?” he asked the boy.
The child looked at both sides but 48   answer. Then Dad placed the three larger snowballs on top of each other.
“It’ s a snowman! The side 49 made me snowman!” the boy replied with 50
Yes, all these people came together and recognized how special each of them was, so they joined in a(n) 51   to build up mankind,” Dad said.
The child then stood up and 52 an arm full of the smaller snowballs. One by one he began to throw them at the other small piles of snow. He said,”This is what happens when people can't work together. They have a(n) 53 .”
Dad was shocked. He stood up, lifted the boy and 54 him tightly, whispering to him, “I hope that your world will learn to work and live together. I hope you will make the right   55
and learn to build the best snowman ever.”

C．responsibility

C．comfortable

D．significant

A．communicate

C．distinguished

A．disappointment

B．frustration

C．organization

D．negotiation

判断题

井下爆破必须使用发爆器，严禁明火爆破。