Electric current gradient process was a new technique for testing the external coatings of the underground pipelines.

电流梯度法是一种地下管道外防护层检测的新技术。

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Change of earth pressure, pore water pressure, underground water level, surface deformation, and sub-surface movement all have direct relationship with distance between shield and testing section.

土压力、孔隙水压力、地下水位、地面变形及深层土体移动的变化都跟掘进机与测试断面之间的距离有直接关系。

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Underground telecommunications works for vehicular and pedestrians traffic areas - part 2 : access covers and frames - requirements , testing , marking.

车辆和人行道区域的底下通讯作业。第2部分：进口盖和框架。要求试验和作标记。

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Is it possible to maintain a safe and reliable nuclear deterrent without realistic underground testing?

CENTERFORSECURITYPOLICY: Center For Security Policy

W. Bush administration had adopted a unilateral moratorium on underground testing seven years before.

CENTERFORSECURITYPOLICY: Are we serious about deterrence?

The National Academy of Sciences will release a study that is expected to deem the Comprehensive Test Ban Treaty (CTBT) verifiable and further underground testing unnecessary.

CENTERFORSECURITYPOLICY: Leading With No One Behind