The main causes of the death of one fetus in twin pregnancy were cord elements(5 cases), fetal deformity(3 cases), velamentous insertion(4 cases)and unknown etiology(15 cases).
双胎之一胎儿死亡主要原因：脐带因素5例、胎儿畸形3例、帆状胎盘4例、原因不明15例。
The Twin Active Subs reflect the synergistic advantage of integrating electronic and acoustic elements into one package.
替补的双主动反映融入一个封装电子和声学因素的协同优势。
Extrusion rate, melt pressure, flow profile and mixing effects of the conical twin screw with mixing elements were observed experimentally.
对混炼型锥形双螺杆的挤出产量、物料压力、物料流动状态及混合效果进行了大量实验研究。
Kneading blocks are a kind of screw elements wildly used in co-rotating twin screw extruders, with complicated shape and high precision.
捏合块是同向双螺杆挤出机中广泛使用着一种螺杆元件，其外形较复杂，精度要求较高。
The screw block and kneading disc are two main functional mixing elements of the co-rotating twin-screw extruder(CRTSE).
螺纹块和捏合盘是同向双螺杆挤出机的主要混合功能元件。
Extrusion of HDPE pellets in flight elements combination is studied by visualized co rotating twin screw extruder. Results show that pellets have little deformation in flight elements combination.
借助于装有玻璃视窗的可视化啮合同向双螺杆挤出机，对高密度聚乙烯(HDPE)颗粒在螺纹元件组合中的熔融过程进行了研究。
New conical twin screw, namely conical twin screw with mixing elements is introduced.
介绍了锥形双螺杆的一个新概念，即混炼型锥形双螺杆。
New conical twin screw, namely conical twin screw with mixing elements is introduced.
介绍了锥形双螺杆的一个新概念，即混炼型锥形双螺杆。
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