单选题:桥梁高程测量网的水准测量精度与桥长有关,对桥长在l000m以上的桥梁,两岸水准连测的测量精度应达到(  )。

题目内容:
桥梁高程测量网的水准测量精度与桥长有关,对桥长在l000m以上的桥梁,两岸水准连测的测量精度应达到(  )。 A.一等
B.二等
C.三等
D.四等
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