开口更大的钢桶将视为活动盖钢桶。
Drums with larger openings are considered to be of the removable head type.
在进行显示范围调整时，必须打开前面的活动盖。调节孔如图二。
If you want to adjusting display range, please open the front lid. As shown as the follows figure.
为防止含生物膜的砂洲生态系统内产生浓沼气引发爆炸，在该处设竖井 和活动盖，人可以进去检测，保证安全运行。
In order to prevent generating thick biogas in the shoalbank ecosystem to cause explosion, a silo and a movable cover are arranged, people may enter and detect to guarantee safe operation.
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