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The butterfly valve butterfly plate installed in pipeline diameter direction.
蝶阀，可以安装在任一个方向上。
Stem should be 400 series stainless steel, can not stem exposed to the butterfly plate fasteners.
阀杆应该是400系列不锈钢，不能将阀杆暴露在蝶板紧固件上。
Objective: To evaluate the biomechanical stability of a cervical spine butterfly plate (CSBP) for unstable cervical spine.
目的：对颈前路蝶型钢板(CSBP)进行生物力学评价。
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