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【单选题】
( )功名的读书人是幕僚最主要的来源。
A.
中级
B.
中、高级
C.
低级
D.
中、低级
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【单选题】已知点P在抛物线y 2 =4x上,则点P到直线l 1 :4x-3y+6=0的距离和到直线l 2 :x=-1的距离之和的最小值为(  )
A.
37 16
B.
11 5
C.
2
D.
3
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【单选题】点M到F(3,0)的距离比它到直线x+4=0的距离小1,则点M的轨迹方程是(  )
A.
y 2 =12x
B.
y 2 =12x(x>0)
C.
y 2 =6x
D.
y 2 =6x(x>0)
【简答题】已知点P在抛物线y 2 =4x上,则点P到直线L 1 :4x-3y+6=0的距离和到直线L 2 :x=-1的距离之和的最小值为______.
【单选题】若点P到直线y=-1的距离比它到点(0,3)的距离小2,则点P的轨迹方程为 (  )
A.
x 2 =12y
B.
y 2 =12x
C.
x 2 =4y
D.
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