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【简答题】
如图,平面直角坐标系 中,已知点 A (2,3),线段 垂直于 轴,垂足为 ,将线段 绕点 A 逆时针方向旋转90°,点 B 落在点 处,直线 与 轴的交于点 。 (1)试求出点 D 的坐标; (2)试求经过 、 、 三点的抛物线的表达式,并写出其顶点 E 的坐标; (3)在(2)中所求抛物线的对称轴上找点 ,使得以点 、 、 为顶点的三角形与△ ACD 相似。
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【单选题】IP 地址是 141.14.72.24 ,子网掩码是 255.255.192.0 ,其网络地址为( )
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【单选题】对于万有引力定律的表达式 下列 说法中正确的是 ( )
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公式中 G 为引力常量,它是人 为规定的
B.
当 r 趋于零时,万有引力趋于无限大
C.
两物体受到的引力总是大小相等的,而与 m 1 、 m 2 是否相等无关
D.
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【简答题】已知 IP 地址是 141.14.72.24 ,子网掩码是 255.255.192.0. 试求网络地址。( )
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【单选题】Earth scientists have come to understand that climate______.
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is going through a fundamental change
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will eventually change from hot to cold
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相关题目:
【单选题】For urban areas this approach was wholly inadequate
A.
really
B.
basically
C.
fundamentally
D.
completely
查看完整题目与答案
【简答题】This agreement is of _____________ (fundament) importance for world trade.
查看完整题目与答案
【简答题】IP 地址是 141.14.72.24,子网掩码是 255.255.192.0,网络地址是什么?
查看完整题目与答案
【单选题】IP 地址是 141.14.72.24 ,子网掩码是 255.255.192.0 ,其网络地址为( )
A.
141.14.64.0
B.
141.14.52.0
C.
141.14.32.0
D.
141.14.128.0
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【单选题】对于万有引力定律的表达式 下列 说法中正确的是 ( )
A.
公式中 G 为引力常量,它是人 为规定的
B.
当 r 趋于零时,万有引力趋于无限大
C.
两物体受到的引力总是大小相等的,而与 m 1 、 m 2 是否相等无关
D.
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【简答题】已知 IP 地址是 141.14.72.24 ,子网掩码是 255.255.192.0. 试求网络地址。( )
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【单选题】Earth scientists have come to understand that climate______.
A.
is going through a fundamental change
B.
has been getting warmer for 10 000 years
C.
will eventually change from hot to cold
D.
has gone through periodical changes
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【简答题】Word Building 1. The loan (able) Jan to buy the house. (Para. 2) 2. You are expected to be an active (participate) . (Para. 2) 3 . The president's (popular) has declined considerably. ( Para. 4 ) 4. S...
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【简答题】There are ________ (fundament) differences between your religious beliefs and mine.
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