短语词组短语heavy oil pre -heater 重油预热器Lube Oil pre -heater 滑油预热器oil -filled electric heater 充油式电暖器electric oil -gas heater 油气电加热器Mini Oil -Filled Heater 小型油热式安全电热器hydrogen side oil -seal heater 氢侧密封油箱加热器 返回 oil heater