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【简答题】
在平面直角坐标系 中,已知二次函数 的图象经过点 和点 ,直线 经过抛物线的顶点且与 轴垂直,垂足为 . （1）求该二次函数的表达式 （2）设抛物线上有一动点 从点 处出发沿抛物线向上运动,其纵坐标 随时间 ≥ )的变化规律为 .现以线段 为直径作⊙C. ①当点 在起始位置点 处时,试判断直线 与⊙C的位置关系,并说明理由；在点 运动的过程中,直线 与⊙C是否始终保持这种位置关系? 请说明你的理由； ②若在点 开始运动的同时,直线 也向上平行移动,且垂足 的纵坐标 随时间 的变化规律为 ,则当 在什么范围内变化时,直线 与⊙C相交? 此时,若直线 被⊙C所截得的弦长为 ,试求 的最大值.
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参考答案：
举一反三
【单选题】一般探伤时不使用深度补偿是因为它会( )
A.
影响缺陷的精确定位
B.
影响AVG曲线或当量定量法的使用
C.
导致小缺陷漏检
D.
以上都不对
查看完整题目与答案
【单选题】What kind of room has Mr. Parker booked?
A.
A single room.
B.
A double room.
C.
A suite.
查看完整题目与答案
【单选题】What type of room does Mr. Bright prefer?
A.
A single room.
B.
A double room.
C.
He doesn’t say.
D.
A luxury twin-sized bedroom.
查看完整题目与答案
【单选题】What does Mr. Simpson want to do?
A.
He wants to have dinner in his room.
B.
He wants to have breakfast in his room.
C.
He wants to see the doctor.
D.
He wants to stay at the hotel the whole day.
查看完整题目与答案
【单选题】听力原文： Mr. Robinson won a lot of money on the football pools, but he did not know what would be the best thing to do with it, so he went to a friend who knew a lot about money matters. This friend said...
A.
He won a lot of money on the lottery.
B.
He won a lot of money on the football pools.
C.
He won a lot of money by buying some modern paintings.
D.
He won a lot of money in an art shop.
查看完整题目与答案
【单选题】What was written on the metal door of the first room in Mr. Wonka's tour?
A.
Staff only
B.
Welcome
C.
Chocolate Room
D.
Guest Room
查看完整题目与答案
【单选题】一般探伤时不使用深度补偿是因为它会:
A.
影响缺陷的精确定位
B.
影响AVG曲线或当量定量法的使用
C.
导致小缺陷漏检
D.
以上都不正确
查看完整题目与答案
【单选题】5 What kind of room did they book for Mr. White ?
A.
A double room on the fifth floor
B.
A single room on the fifth floor
C.
A single room on the fifteenth floor
D.
A double room on the fifteenth floor
查看完整题目与答案
【单选题】中暑和发热都可引起恒温动物体温升高,其区别的关键在于( )
A.
体温调节中枢的调定点是否上移
B.
产热器官功能是否异常
C.
外界环境温度是否升高
D.
可否通过物理性方法降温
E.
有否病原感染
查看完整题目与答案
【单选题】What room in Mr. Wonka's factory was most coveted(垂涎) by evil chocolate makers?
A.
The Chocolate Room
B.
The Recipe Vault
C.
The Inventing Room
D.
The Chamber of Secrets
查看完整题目与答案
相关题目：
【单选题】一般探伤时不使用深度补偿是因为它会( )
A.
影响缺陷的精确定位
B.
影响AVG曲线或当量定量法的使用
C.
导致小缺陷漏检
D.
以上都不对
查看完整题目与答案
【单选题】What kind of room has Mr. Parker booked?
A.
A single room.
B.
A double room.
C.
A suite.
查看完整题目与答案
【单选题】What type of room does Mr. Bright prefer?
A.
A single room.
B.
A double room.
C.
He doesn’t say.
D.
A luxury twin-sized bedroom.
查看完整题目与答案
【单选题】What does Mr. Simpson want to do?
A.
He wants to have dinner in his room.
B.
He wants to have breakfast in his room.
C.
He wants to see the doctor.
D.
He wants to stay at the hotel the whole day.
查看完整题目与答案
【单选题】听力原文： Mr. Robinson won a lot of money on the football pools, but he did not know what would be the best thing to do with it, so he went to a friend who knew a lot about money matters. This friend said...
A.
He won a lot of money on the lottery.
B.
He won a lot of money on the football pools.
C.
He won a lot of money by buying some modern paintings.
D.
He won a lot of money in an art shop.
查看完整题目与答案
【单选题】What was written on the metal door of the first room in Mr. Wonka's tour?
A.
Staff only
B.
Welcome
C.
Chocolate Room
D.
Guest Room
查看完整题目与答案
【单选题】一般探伤时不使用深度补偿是因为它会:
A.
影响缺陷的精确定位
B.
影响AVG曲线或当量定量法的使用
C.
导致小缺陷漏检
D.
以上都不正确
查看完整题目与答案
【单选题】5 What kind of room did they book for Mr. White ?
A.
A double room on the fifth floor
B.
A single room on the fifth floor
C.
A single room on the fifteenth floor
D.
A double room on the fifteenth floor
查看完整题目与答案
【单选题】中暑和发热都可引起恒温动物体温升高,其区别的关键在于( )
A.
体温调节中枢的调定点是否上移
B.
产热器官功能是否异常
C.
外界环境温度是否升高
D.
可否通过物理性方法降温
E.
有否病原感染
查看完整题目与答案
【单选题】What room in Mr. Wonka's factory was most coveted(垂涎) by evil chocolate makers?
A.
The Chocolate Room
B.
The Recipe Vault
C.
The Inventing Room
D.
The Chamber of Secrets
查看完整题目与答案
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