【Utilities – Civil Engineering Version】20181120
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Leveling benchmarks serve as the basis for settlement observations; therefore, the installation of leveling benchmarks must meet certain requirements (). A: Sufficient stability is required. B: A certain level of observation accuracy must be achieved. C: The number of settlement observation points. D: The location of the settlement observation points. E: Conditions for verification are necessary. Answer: ABE
A: Sufficient stability is required. B: A certain level of observation accuracy must be achieved. C: The number of settlement observation points. D: The location of the settlement observation points. E: Conditions for verification must be available