Based on the characteristics of double cavity central venous catheters, Selected the suitable extruding process, and designed the extruding die.
前言：根据双腔中心静脉导管的特点，选择了合适的导管成型工艺，并设计了挤出机机头的芯模和口模。
An external layer of compact Bone surrounds a central area of spongy Bone, except at the marrow cavity.
骨的外层为质密的骨皮质，包围着海绵状骨松质中心区（不算骨髓腔）。
Purpose: To search the value of central venous catheter in the diagnosis and treatment which was placed in serous membrane cavity for the treatment of malignant fluid.
目的应用中心静脉导管对恶性浆膜腔积液的置管，探索其在诊断治疗上的价值。
Cutting across a bright cavity of ionized gas, the dust torus surrounding the central star is in the upper right corner of this view, nearly edge-on to the line-of-sight.
这道几乎是侧对著我们的拱中心星尘埃环，位在这张影像的中左上方，斜切过一团明亮的游离云气。
When such a steel solidifies, a shrinkage cavity know as a "pipe" is formed in the top central part of the ingots.
当这种钢液凝固时，在钢锭头部中央会形成收缩孔。
When such a steel solidifies, a shrinkage cavity know as a "pipe" is formed in the top central part of the ingots.
当这种钢液凝固时，在钢锭头部中央会形成收缩孔。
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