【简答题】已知函数 ,且 的最大值为2,其图象相邻两对称轴间的距离为2,并过点 . (1)求 的值; (2)若函数 在 上的图象与 轴的交点分别为 、 ,求 与 的夹角.
【简答题】如图,在直角坐标系中,直线y= x+4与x轴、y轴分别交于A. B两点,过点A作CA⊥AB,CA= ,并且作CD⊥x轴 (1)求证:△ADC∽△BOA; (2)若抛物线y= -x 2 +bx+c 经过B、C两点 ①求抛物线的解析式; ②该抛物线的顶点为P,M是坐标轴上的一个点,若直线PM与y轴的夹角为30°,请直接写出点M的坐标。
【简答题】A) name B) idea C) expression D) image
【单选题】当视频素材不能以正常帧速率播放时,时间轴面板的时间标尺处将出现【 】提示。
【单选题】HTML文档中,嵌人图片文件“image, jpg”使用的语句是
【单选题】It is important to dress right for an interview because that critical first impression is all you will be able to give. ___________. While image is not everything, it is important.
A.
Look for and buy clothes that are durable and dependable
B.
Most interviews last less than 20 minutes
C.
Be careful not to use slang expressions
D.
One key is to wear clothes to the interview that reflect the job you want
【简答题】(本题满分12分) 已知点 ,动点 、 分别在 、 轴上运动,满足 , 为动点,并且满足 . (1)求点 的轨迹 的方程; (2)过点 的直线 (不与 轴垂直)与曲线 交于 两点,设点 , 与 的夹角为 ,求证: .
【简答题】[A]image [B]figure [C]voice [D]sound
【单选题】-What time does your mother get home every day? -_________ five o’clock.
【单选题】What does Mrs. Leech say about the classes in her school?
A.
There are five or six groups in each class.
B.
There are 30 to 40 children in each class.
C.
There are five or six children in each class.
D.
There are 13 to 14 children in each class.