单选题测者眼高为9m,物标高程为36m,则物标地理能见距离为()nmile。A6.27B12.54C18.81D19.84
单选题
测者眼高为9m,物标高程为36m,则物标地理能见距离为()nmile。
A
6.27
B
12.54
C
18.81
D
19.84
参考解析
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