The field investigations show that ground pressure of coal face with high productivity depends on face advance rate.
通过现场实测，得出了对浅埋煤层高产高效工作面顶板来压特征和不同推进速度的矿压显现规律。
The first advance was made in ascertaining that the chemical activity of the discharge was very considerably increased by using currents of extremely high frequency or rate of vibration.
现在确定，首先第一步的是，通过利用极高频率或振动比率的电流来有效地提升电流的化学活跃程度。
The first advance was made in ascertaining that the chemical activity of the discharge was very considerably increased by using currents of extremely high frequency or rate of vibration.
现在确定，首先第一步的是，通过利用极高频率或振动比率的电流来有效地提升电流的化学活跃程度。
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