As a special hydrodynamic sound generator, ultrasonic siren has applicative effects on viscosity reduction, scale removal on electric pump well.
作为一种特殊的流体动力式声波发生器，超声旋笛在电泵井防垢降粘方面有着显著的使用效果。
The use and applicative effects of radio wave tunnel perspective instrument in Wangzhuang Coal Mine are introduced. And some further more improving opinions appearing in use are provided.
介绍了无线电波坑道透视仪在王庄煤矿的使用及应用效果，对仪器使用中出现的一些问题，提出了改进意见。
The use and applicative effects of radio wave tunnel perspective instrument in Wangzhuang Coal Mine are introduced. And some further more improving opinions appearing in use are provided.
介绍了无线电波坑道透视仪在王庄煤矿的使用及应用效果，对仪器使用中出现的一些问题，提出了改进意见。
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