This paper introduces the properties of cement additive, hollow float beads, and its application in oilwell cementing.

本文介绍了水泥外加剂——空心漂珠的特性及其在油田固井中的应用。

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The drain valve is opened or closed by taking advantage of the change of liquid level of condensate water with the high-precision grinding stainless steel hollow float ball in the valve cavity.

利用高精度研磨不锈钢空心浮球在阀腔内随着凝结水的液位变化开启或关闭阀门。

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The rest of the vertical column is made from a material called syntactic foam - a solid made mostly of hollow "microballoons" - giving it enough buoyancy to float back up.

BBC: James Cameron back on surface after deepest ocean dive