Even the test ban and a new treaty to cutoff production of fissile material—both obvious first steps to a nuclear-free future—will be dogged with difficulty.
The characteristics of the test signals were analyzed and weak defect echo signals were successfully extracted by cut-off frequency technique.
分析了检测信号的特征，并采用截止频率法成功地提取了微弱的缺陷回波信号。
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The high sensitivity of the new procalcitonin test has allowed the scientists to establish realistic cut-off values to help guide clinicians in identifying children who are at low risk for SBIs.