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【单选题】
数控机床运动坐标轴用右手直角笛卡儿坐标系表示X、Y、Z三个,中指、食指和大拇指方向依次分别定义为()
A.
XYZ
B.
ZXY
C.
YXZ
D.
ZYX
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【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】(1)直线AD是( );(2)直线EB是( ) (3)直线FC是( );(4)直线AB是( )
【单选题】What traditional performances can people see at the temple fair?
A.
singing and dancing
B.
circus
C.
performances representing palace events
【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
【单选题】已知定义的DataFrame如下:【图片】df['city']的结果是?
A.
0 北京 1 上海 2 广州 3 北京 Name:city,dtype:object
B.
北京 上海 广州 北京
C.
北京
D.
以上都不对
【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ÐBAE=ÐC. (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,△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 .
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