steel sheathing meaning in Chinese

钢棉面板
钢面板

The unit shall be equipped with a standard 120v plug - in cord . electrical heating elements shall be screw - in , direct - immersion , stainless steel sheathed , resistance - type . element operation shall be controlled by a thermostat
这种热水器应该配置一个标准的120伏插头电缆。电气加热元件应该螺纹拧进的，直接浸入式，不锈钢外层，电阻型加热元件。加热元件的工作应该由一个温控器控制调节。