对采掘工作面放炮后，CO传感器上显示体积分数值与实际值相比较显示值偏大的原因进行了分析，同时提出了综合性的防范措施。
The cause of the high display value of CO sensor after blasting in driving or mining faces is analyzed, and the comprehensive measures are put forward.
非零偏移距VSP就是在距离井口有一定距离的位置放炮，在井内安置检波器接收地震波，属于二维观测。
The shot is located in some distance from well and the geophone is positioned inside the well to receive the seismic wave, the method is called VSP which belongs to 2d data acquisition.
非零偏移距VSP就是在距离井口有一定距离的位置放炮，在井内安置检波器接收地震波，属于二维观测。
The shot is located in some distance from well and the geophone is positioned inside the well to receive the seismic wave, the method is called VSP which belongs to 2d data acquisition.
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