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。
3
The model test for simulating effect of suspended cut-off wall on preventing seepage failure in two-layer foundation of levee has been carried out in a sandbox.