The test methods at present fall into three types: threshold method, morphological method and grey level statistics method.

目前纸病检测方法分为阈值法、形态学方法、灰度级统计法三类。

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Objective to investigate the relationship between minimum contralateral masking level (MCML) and pure tone threshold of the masking ears by the same frequency tone masking test.

目的应用同频音掩蔽试验观察不同个体最小对侧掩蔽级(MCML)与主观纯音听阈之间的关系，进而通过MCML判定被试者主观真实听阈。

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However, further test results confirmed that the level of DNA was under the reporting threshold.

BBC: Horse DNA found in two takeaway burgers, FSA says