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问题 单项选择题

已知铜母线TMY-60×6，ι=15m，母线相间距离250mm，水平排列，母线平放，求母线电抗的有名值为（）。

A.2.89mΩ

B.2.08mΩ

C.3.18mΩ

D.1.87mΩ

答案

参考答案：A

单项选择题

Many years ago, when I was fresh out of school and working in Denver, I was driving to my parents’ home in Missouri for Christmas. I stopped at a gas station (加油站) about 50 miles from Oklahoma City, where I was planning to stop and visit a friend. While I was standing in line at the cash register (收款台) I said hello to an older couple who were also paying for gas.
I took off, but had gone only a few miles when black smoke poured from the back of my car. I stopped and wondered what I should do. A car pulled up behind me. It was the couple I had spoken to at the gas station. They said they would take me to my friend’s. We chatted on the way into the city, and when I got out of the car, the husband gave me his business card.
I wrote him and his wife a thank-you note for helping me. Soon afterward, I received a Christmas present from them. Their note that came with it said that helping me had made their holidays meaningful.
Years later, I drove to a meeting in a nearby town in the morning. In late afternoon I returned to my car and found that I’d left the lights on all day, and the battery (电池) was dead. Then I noticed that the Friendly Ford dealership—a shop selling cars—was right next door. I walked over and found two salesmen in the showroom.
"Just how friendly is Friendly Ford" I asked and explained my trouble. They quickly drove a pickup truck to my car and started it. They would accept no payment, so when I got home, I wrote them a note to say thanks. I received a letter back from one of the salesmen. No one had ever taken the time to write to him and say thank you, and it meant a lot, he said.
"Thank you" —two powerful words. They’re easy to say and mean so much.

The author planned to stop at Oklahoma City ______.

A．to visit a friend

B．to see his parents

C．to pay at the cash register

D．to have more gas for his car
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填空题

设

#define F(x)x*x

main()

{inta=3，b=4，c；

c=F(a+b)；

printf ("%d\n"，c)；

}

则程序执行后输出的值是______。
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