THE INFLUENCE OF AMBIENT TEMPERATURE AND PREHEATING WATER TEMPERTURE ON TEMPERATURE FIELD OF SOIL DURING PREHEATING BURIED HOT CRUDE OIL PIPELINE FOR STARTUP是什么意思 THE INFLUENCE OF AMBIENT TEMPERATURE AND PREHEATING WATER TEMPERTURE ON TEMPERATURE FIELD OF SOIL DURING PREHEATING BURIED HOT CRUDE OIL PIPELINE FOR STARTUP怎么读