皮皮学,免费搜题
登录
搜题
【单选题】
质点做匀速圆周运动时,下列说法正确的是( )
A.
.线速度越大,周期一定越小
B.
.角速度越小,周期一定越小
C.
.转速越大,周期一定越小
D.
.圆周半径越小,周期一定越小
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【简答题】看图填空,一空一词。 1. What can you see in the picture? We can see that a school ______ ______ a skating Marathon. 2. How many people are there in the picture? And who are they? There are seven. Five are stude...
【简答题】如图,在△ABC中,AD⊥BC于D,AB=AC,过点B作射线BP交AD、AC分别于E、F,与过C点平行于AB的直线交于点P。 (1)求证:EB 2 =EF·EP; (2)若过B点的射线交AD、AC的延长线分别于E、F,与过C点平行于AB的直线交于P点,则结论(1)是否仍然成立?如果成立,请给出证明。
【简答题】如图,△ABC内接于⊙O,AD是⊙O直径,过点A的切线与CB的延长线交于点E. (1)求证:EA 2 =EB?EC; (2)若EA=AC, cos∠EAB= 4 5 ,AE=12,求⊙O的半径.
【简答题】(本题7分)  如图是一直角三角形纸片,两直角边AC=6,BC=8,现将直角三角形沿直线AD折叠,使AC边落在斜边AB上,且与AE重合. 小题1:(1)求EB长; 小题2:(2)求△DBE的面积.
【单选题】What can we infer from this passage?
A.
Black people buy tickets to see white people play games in NBA.
B.
NBA players who have ever-upward-spiraling paychecks shape the league's bad image.
C.
Emotional distance between NBA and the whites is NBA players' skills.
D.
Hip-hop culture is harmful to NBA.
【简答题】已知:⊙O中,OB、OC是半径,DF⊥OC于F,AE⊥OB于E,若AB=CD,求证:AE=DF.
【单选题】What's the best place to test the aroma of a particular perfume?
A.
Wrist
B.
Behind the ear
C.
Neck
【多选题】What is aroma in Chinese culinary arts?
A.
the smell of the dish
B.
the freshness of the materials
C.
the blending of seasoning
【简答题】如图,△ABC内接于⊙O,AD是⊙O直径,E是CB延长线上一点,且∠BAE=∠C. (1)求证:直线AE是⊙O的切线; (2)若EB=AB, ,AE=24,求EB的长及⊙O的半径.
【简答题】如图,在长方体 ABCD ­ A 1 B 1 C 1 D 1 中,已知 AB =4, AD =3, AA 1 =2, E , F 分别是棱 AB , BC 上的点,且 EB = FB =1. (1)求异面直线 EC 1 与 FD 1 所成角的余弦值; (2)试在面 A 1 B 1 C 1 D 1 上确定一点 G ,使 DG ⊥平面 D 1 EF .
相关题目: