To counter the effects of joints on the production of coal mine, the paper advances a new method to forecast the frequency of joints in coal bed and its roof.
针对节理对煤矿生产的影响。本文提出一种预测煤层及其顶板节理频率的新方法。
Objective To investigate the value of high frequency ultrasonography in the diagnosis of finger joints damage in rheumatoid arthritis (RA) patients.
目的探讨高频超声在诊断类风湿关节炎（RA）患者手指关节病变中的价值。
It is indicated that the high frequency amplitude of the signals is decreased with the increase of spot size and strength of joints.
研究表明，高频信号幅度值随焊核直径和接头强度的增加而下降。
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