对于废气涡轮增压器不正确的是（）.
A.涡轮机是将发动机排气的能量转变为机械功的装置
B.排气流过涡轮机渐缩形叶片式喷管时降压、降温、增速、膨胀，使排气的压力能转变为动能，流出的高速气流冲击叶轮，推动叶轮旋转
C.空气从压气机旋转的叶轮获得能量，使其流速、压力和温度均有较大的增高，然后进入叶片式扩压管中
D.空气流过压气机渐扩形流道的扩压管时减速增压，温度也有所升高，即在扩压管中，空气所具有的大部分压力能转变为动能
参考答案：D
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| My father was raised in a fatherless home at a time when the family of five struggled to survive, which caused my father to be extremely tightfisted (吝啬) with money. When we children became 1 that other children got pocket money from their parents, we made a(n) 2 to ask our father for some. Immediately his face turned stone-cold, and he said, "If you're old enough to ask, you're old enough to 3 ." And we had to seek odd jobs about the neighborhood. He didn't 4 his attitude as we grew into adulthood. There was a time when 5 of us had a car, so we had to ride a 6 whenever we came home. Though the bus stopped about two miles from home. Dad never met us, 7 in bad weather. If someone 8 (and my brothers did a lot), he'd say in his 9 father-voice, "That's what your legs are 10 !" One spring evening I was on the bus home from 11 . Tests and long hours in labs had 12 me exhausted. As other students were 13 at their stops, I looked silently out of the window. Finally, the bus came to a 14 at my destination, and I 15 , carrying my suitcase to begin the long journey home. The row of privet hedge (树篱) came into 16 , which lined the driveway that climbed the hill to our house. I stopped to put a book in the suitcase. When I stood up, I saw something gray 17 along the top of the hedge toward the house. It was the top of my father's head, I 18 . Then, each time I came home, be would stand behind the hedge, watching, 19 he knew I had arrived safely. I held back my tears. He did care, 20 . Upon reaching home, I found my father sitting innocently in his chair. "So! It's you!" he said, his face lengthening into surprise. | ||||
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