题目内容
(请给出正确答案)
[单选题]
已知AB两点的高程HA=92m,HB=94.20m,在图上量取AB两点的距离为2cm,地形图比例尺为1:500,则直线AB的坡度为()。
A.22%
B.2.2%
C.-22%
D.-2.2%
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A.22%
B.2.2%
C.-22%
D.-2.2%
A.6.8%
B.1.5%
C.-1.5%
D.-6.8%
A.1%
B.2%
C.3%
D.4%
A.2%
B.-2%
C.2‰
D.-2‰
(1)求椭圆的标准方程;
(2)过F的直线与椭圆交于A,B两点,线段AB的垂直平分线分别交直线l和AB于点P,C,若PC=2AB,求直线AB的方程.
A.1.163m
B.0.127m
C.2.199m
D.1.036m
A.-156.433m
B.105.176m
C.105.046m
D.-156.345m