【单选题】
导线全长620m，算得x坐标增量闭合差为0.12m，y坐标增量闭合差为－0.16m，则导线全长相对闭合差为()。
①
1/2200
②
1/3100
③
1/4500
④
1/15500
【单选题】
平面的正面投影积聚为一条直线并与OX轴平行，该平面是（ ）。
①
Normal
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7.8 磅
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EN-US
ZH-CN
X-NONE
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②
Normal
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④
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铅垂面