| 摘要 |
<p>The lid (10) has a filling aperture (12) with a movable closing element in the form of the seesaw (20) turning on an axis (21) on the lid. The first arm (30) of the seesaw has a closing plate (31) on it and the second arm (40) has a counterweight (41) on it. The torque of the second arm is greater than that of the first arm.</p> |
