圆x2+y2-2x-3=0的圆心到直线y=2x的距离为( ) A.55 B.255C

题型:选择题

问题:

圆x2+y2-2x-3=0的圆心到直线y=2x的距离为(  )
A.
5
5
B.
2
5
5
C.
5
D.
5
2
考点:点到直线的距离
题型:选择题

Miss Maynell and I grew to know each other through the mail. When World War II ended, I returned from Europe. We planned our first meeting at the Grand Central Station in New York.

At seven, I was in the station and waited for the girl whose heart I loved but whose face I’d never seen.

Suddenly a girl in a green suit was coming toward me. I stood up from the bench and started toward her, completely forgetting to notice that she was not wearing a rose.

“Going my way, sailor?” the girl murmured, walking away quickly. I made one step closer to her and then I saw Miss Maynell, who was well past 40, standing almost directly behind her with a red rose. I felt something even better than love. I didn’t hesitate and walked to her. “I’m John Blanchard, and you must be Miss Maynell,” I said, feeling shocked by the bitterness of disappointment. “I’m glad you could meet me. May I take you to dinner?”

The woman smiled. “I don’t know what this is about, son,” she answered. “But the young lady in the green suit begged me to wear this rose. And she said if you were to invited me to dinner, I should tell you that she is waiting for you in a big restaurant across the street. She said it was some kind of test!”

54What did John Blanchard go to the station for?        

A. To see the middle-aged woman

B. To wait for a girl from Europe.

C. To invite the woman with a rose to dinner.

D. To meet his lover as planned.

55.How could John Blanchard recognize the girl?       

A. By her green suit                              B. By her red rose

C. By her beautiful face                      D. By her pictures

56 Why did John feel disappointed? Because _______.

A. he realized that it was not love

B. he found the girl was going away

C. he failed to find the girl with a rose

D. he knew that the girl would test him.

题型:选择题

物资验收记录能为()等提供原始资料,是分清供、需、运各当事方责任,加强供应商管理的重要依据。

题型:选择题

宝宝3岁,请判断其各种能力的正常状态。

有关记忆能力的发展,正常的是()

A.记忆能力比较差

B.能有意识地回忆数天前发生的事件

C.重现能力很弱

D.能再认3个月前的人和物

E.重现仅限于1周前的事

F.能回忆1年前的人和物

题型:选择题

我国农产品进口关税配额为( )

A.国营贸易配额

B.国内配额

C.非国营贸易配额

D.全球配额

题型:选择题

发电机启动升压过程中,监视转子电流的目的是()

A、监视转子电流和与之对应的定子电压,可以发现励磁回路有无短路

B、额定电压下的转子电流较额定空载励磁电流显著增大时,可以粗略判定转子有匝间短路或定子铁芯有局部短路

C、电压回路断线或电压表卡涩时,防止发电机电压升高,威胁绝缘

D、为了判断发电机出口及主变压器高压侧有无短路线

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