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水准原点
bridg.constr. original bench mark
space basic leveling origin; leveling origin
tech. basic levelling origin; datum mark of leveling; datum mark of levelling; levelling origin; original benchmark
水准原点国家高程控制网的起算点。我国水准原点设在青岛
expl. leveling origin
水准原点
: 3 phrases in 1 subject
Technology3

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