Summarize the principle, methods, advisability, repetition and superiority of brachial artery ultrasound used in testing endothelial cell function.

并肱动脉超声检测血管内皮功能的原理、方法、可行性、重复性和优越性作了综述。

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Through field test, the reliability of metal material separation is affirmed by sclerometer testing repetition measurement. Moreover, ejection experiments are made in shooting range.

通过现场试验，以硬度计检测复检确认了金属材料分选仪的可靠性，并进行靶场退壳试验。

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