Most cement heads can hold both the top and bottom plugs.
大部分的水泥头都既可以悬挂上胶塞，又可以悬挂下胶塞。
Suitable tests for confirm tightness of ship's bottom plugs to be carried out before launching.
船底塞在下水之前应该进行一些适当的实验。
A component installed near the bottom of the casing string on which the cement plugs land during the primary cementing operation.
安装在套管柱底部附近的一个部件，在初次注水泥作业期间水泥塞坐放于其上。
Ear anti-inflammatory painkillers. For ear bottom, ear plugs, ear flow of yellow water embolism.
耳消炎止痛药。耳底，耳塞，耳朵流黄水等症。
Ear anti-inflammatory painkillers. For ear bottom, ear plugs, ear flow of yellow water embolism.
耳消炎止痛药。耳底，耳塞，耳朵流黄水等症。
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