The flexible sleeve has a hollow interior which forms an internal fluid chamber.
灵活的套有一个中空的内部形成一个内部流体室。
Internal flush joints are most common, offering no restriction to fluid flow.
内平式接头最为普遍，它对流体的流动没有限制。
Internal flush joints are most common, offering no restriction to fluid flow.
内平式接头最为普遍，它对流体的流动没有限制。
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