【单选题】
在地形图上，量得A点高程为21.17m，B点高程为16.84m，AB距离为279.51m，则直线AB的坡度为（ ）。
①
6.8%
②
1.5%
③
-1.5%
④
-6.8%
【单选题】
直线AB的正面投影与OX轴倾斜，水平投影与OX轴平行，则直线AB是( )
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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水平线
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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正平线
③
Normal
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7.8 磅
0
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ZH-CN
X-NONE
侧垂线
④
Normal
0
7.8 磅
0
2
false
false
false
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ZH-CN
X-NONE
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一般位置线