问题
单项选择题
在关系中，"基数"（Cardinality）是指（）
A.行数
B.属性个数
C.关系个数
D.列数
答案
参考答案：A
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在关系中，"基数"（Cardinality）是指（）
A.行数
B.属性个数
C.关系个数
D.列数
参考答案：A
I watch her and her mother decorate her college dormitory room. Everything is in place organized and arranged. Her room nicely accommodates not only her clothes and bric-a-brac(小摆设), but her ___36___ as well. I begin to accept that her room at home is no longer hers. It is now ours, our room for her when she ___37___. I ___38___ myself thinking of when I held her in the cradle of my arm, in the chair alongside my wife's hospital bed. One day old. So ___39___, so beautiful, so perfect, so ___40___ dependent on her new, ___41___ parents. Time marches relentlessly(不停地). She looks up now, catching me ___42___ at her, causing her to say to her mother." Mom, Dad's looking at me ___43____”. The last few days, I touch her arm, her face--- ___44___ that when my wife and I return home, she will not be ___45___ us. I have so much to say, but no ___46___ with which to say it. My ___47___ changed from the day I drove this child home from the hospital. I saw myself ___48___ that day, and it has led to a lot of places that I would never have found on my own. She says, “It'll be all right, Dad. I'll be home from school ___49___.” I tell her she will have a great year but I say little else. I am afraid somehow to speak and I only hold on to our good-bye hug a little longer, a little ___50___. I gaze into her eyes and ___51___to go. My wife's eyes follow her as she leaves us. ___52___ do not. Maybe if I don't look, I can imagine that she really hasn't ___53___ ; I know that what she is embarking upon(开始) is exciting and wonderful. I remember what the world looked like to me ___54___ everything was new. As I walk to the car with my wife at my side, my eyes are wet, my heart is sore, and I realize that my life is ___55___ forever.
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