| 摘要 |
<p>An electric heater includes a metal line heating element (12) mounted on an inner circumferential surface of a cylindrical main adiabatic body (11). The heating element (12) consists of a plurality of resistance heating blocks (61 to 64,71 to 74, 81 to 84), arranged in the length direction. The resistance heating blocks (61 to 64, 71 to 74, 81 to 84) are connected parallel to each other.</p> |
