常見例句雙語(yǔ)例句The echometer was used to monitor the change of the annular water level in the coal- bed methane(CBM)wells production, which could decrease pressure stably and continuously.在煤層氣井排采過(guò)程中，通常用回聲儀來(lái)監(jiān)測(cè)環(huán)空液面變化，通過(guò)控制液面下降速度來(lái)實(shí)現(xiàn)穩(wěn)定、連續(xù)降壓。 返回 echometer