Relevelling the bench marks and monitoring Wells that surveyed 20year ago proves the ground subsidence in Yangzhou city.
通过对20年前测量过的一些水准点和监测井的水准复测，证实扬州市城区确实有地面沉降的发生。
Relevelling the bench marks and monitoring Wells that surveyed 20year ago proves the ground subsidence in Yangzhou city.
通过对20年前测量过的一些水准点和监测井的水准复测，证实扬州市城区确实有地面沉降的发生。
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