初步研究了抗剪切降解型分子缔合减阻剂，通过分子缔合减阻剂多次的减阻测试，发现缔合减阻剂在抗剪切降解性方面有较大提高。
Drag reducing agent through molecular associations have high shear stability in turbulent flow was studied and found its shear stability in turbulent flow has been improved greatly.
针对多次冲击载荷的性质和特点，提出了几种适合于多冲形变研究的方法，并对其可行性进行了探讨。
Against the characters of repeated impact load, we pointed out some research methods suitable for the deformation research of repeated impact, and discussed its practicability.
目的：研究单次放射治疗与多次分割放射治疗对于骨转移性疼痛止痛效果。
Objective: To explore the pain relief effect with a single fraction and multifraction radiotherapy for bone metastases.
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