问题
单项选择题
用于各种加热炉工程，锅炉耐热管道及过热器管道的是( )。
A．无缝钢管
B．焊接钢管
C．合金钢管
D．螺旋钢管
答案
参考答案：C
解析：耐热合金钢管具有强度高、耐热的优点。所以合金钢管用于各种加热炉工程，锅炉耐热管道及过热器管道等。
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用于各种加热炉工程，锅炉耐热管道及过热器管道的是( )。
A．无缝钢管
B．焊接钢管
C．合金钢管
D．螺旋钢管
参考答案：C
解析：耐热合金钢管具有强度高、耐热的优点。所以合金钢管用于各种加热炉工程，锅炉耐热管道及过热器管道等。
A poor farmer had a friend who was famous for the wonderful apples he grew. One day, his friend ___36__ him a young apple tree and told him to take it home and __37____it. Seeing the gift, the farmer was very__38____, and he thought he would also have a lot of wonderful apples, but when he got home, he had a(n) ___39__. He didn’t know___40___ to plant it. He thought over and over and __41___ every place he could think of. __42____ he decided to plant the tree in his woods. There were many high trees with thick leaves in the woods. With those trees around no one else could___43___ the young apple tree. He even felt proud of himself for finding so___44___ a place for the apple tree. Every day he went to take care of the tree, __45___ it. To his surprise and ___46___, the apple tree didn’t grow as he had __47___. It died without sunlight and good soil. Later the friend asked the farmer why he had planted the tree in such a __48__ place. “ What’s the difference?” the farmer said angrily, “ If I had planted the tree near the___49____, passers-by would have stolen the fruit. If I had planted the tree in one of my fields, my neighbours would have come at night and ___50___ some of the apples! If I had planted it near my house, my own children would have taken the ___51_. No matter where I plant the tree, I can’t have__52____ to enjoy the apples. So there is no difference where I planted it.” “ Yes,” said the friend, “but __53____ someone could have enjoyed the fruit. Now you not only have robbed everyone of the fruit, but also have __54___ a good apple tree! You don’t know the true meaning of ‘share’!” We should learn to __55___ in our life, The more you want to own something all by yourself, the less you get at last. 小题1:.
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