7、25. Functiontestandcalibrationself-heterodynecurvefordirectionfinderonseatrial.航行试验中测向仪效用试验及自差曲线校正。26. Inspectioninstallationforantennaofradioconsoleandmeasuringitsinsulationresistance.组装报务台天线安装检查和绝缘测量。27. Functiontestofradioconsoleonseatrial.航行试验中组装报务台效用试验。28. Cal