煤化程度越高的煤导电性越好，且甲烷气体在煤中的电动效应越明显；
The higher the degree of coal metamorphism is, the better the conductivity of coal is and the clearer the electric effect of methane gas in coal is.
通过电动式标定和振动台标定对地震计的灵敏度、频率响应特性、线性度、横向效应、噪声特性和动态范围进行了测试。
The properties of the seismometer are tested by calibration, such as its sensitivity, frequency response, linearity, noise, SNR, transversal effect, dynamic range and so on.
针对直流电动机中电枢磁动势的轴线位置由电刷决定的特征，提出了箝位概念，指出自控变频乃是箝位效应的直接后果。
Aimed at the feature that the locality of axis of the armature MMF is determined by the brush in dc motor, a new concept on clamp is proposed.
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