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[单选题]
某导线全长620m,纵横坐标增量闭合差分别为fx=0.12m,fy=-0.16m,则导线全长相对闭合差为()
A.1/2200
B.1/3100
C.1/4500
D.1/15500
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.1/2200
B.1/3100
C.1/4500
D.1/15500
第7题
A.1/4911
B.1/6548
C.1/3929
D.1/4000
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