【单选题】
A点坐标为（10、20、30），B点坐标为（30、20、30）则AB距离为______。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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③
Normal
0
7.8 磅
0
2
false
false
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ZH-CN
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④
Normal
0
7.8 磅
0
2
false
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铅垂线
【单选题】
坐标增量的“+”或“-”，决定了直线所指向的象限，当直线指向Ⅰ象限时，坐标增量中（ ）。
①
ΔX为+，ΔY为+
②
ΔX为+，ΔY为
③
-ΔX为-，ΔY为+
④
ΔX为-，ΔY为-
【单选题】
我国某点的自然坐标y= -1235.235m，属于35带，问其国家统一坐标为（）
①
A.Y=498764.765m?
②
B.Y=35498764.765m
③
C.Y=35501235.235m
④
D.Y=501235.235m?