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【单选题】
测得有三个测站的一条闭合水准路线,各站高差分别为1.501m、0.499m和-2.009m,则该路线的闭合差和各站改正后的高差为()m。
A.
+0.009;1.504、0.502和-2.006
B.
-0.009;1.498、0.496和-2.012
C.
-0.009;1.504、0.502和-2.006
D.
-0.009;1.504、0.505和-2.000
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