问题
单项选择题
著名的“响尾蛇”空对空导弹是采用（）。
A．雷达制导系统
B．红外线制导系统
C．激光制导系统
D．机械制导系统
答案
参考答案：B
解析：
“响尾蛇”空对空导弹是美国研制的近距离空对空导弹，代号为AIM-9。它是世界上装备数量最多的空对空导弹，采用鸭式气动布局，红外线制导系统。
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著名的“响尾蛇”空对空导弹是采用（）。
A．雷达制导系统
B．红外线制导系统
C．激光制导系统
D．机械制导系统
参考答案：B
解析：
“响尾蛇”空对空导弹是美国研制的近距离空对空导弹，代号为AIM-9。它是世界上装备数量最多的空对空导弹，采用鸭式气动布局，红外线制导系统。
When I was a small boy my family was very poor. My father always used his savings to my mother to visit her parents who lived far away. There was just my younger brother and myself in the house. One evening Dad came home from and there was no food in the house, not a piece of bread. Although we were , my brother and I went to bed without eating anything. My father had no money, but I knew from the on his face that he could not let us have an empty stomach. He the house and about two hours later returned and quickly us up. He had in his hand two small potato pies, which he gave us to eat. I don't know where he got the but somehow he to get us something to eat. My father had not eaten and had worked all day he sat there with great satisfaction watching us eat. This has stayed in my mind and left more of an impression than any amount of he may ever have given me. At that moment, I felt happy knowing that he was there and would not let us . I guess the I am trying to make is that in difficult times it is not to show weakness but strength and character. If a is the cement (粘合剂) that holds a family together, then the father is that strengthens that cement. It is his values and and memories that have carried me forward and helped me to my own problems in life. In my own I have learned that it is the valuable time you spend with your children and the values you give to them that will remain with them always.
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