The plateau-gully-slope morphological pattern of Loess plateau provided a natural foundation of land use structure in the county.

黄土髙原沟壑区塬、坡、沟的地貌格局是土地利用空间格局的自然基础。

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Objective: to observe the morphological pattern of collateral anastomoses of extracranial vertebral arteries and discuss its clinical significance.

目的：观察椎动脉颅外段的侧支吻合情况，并探讨其临床意义。

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Objective: to observe the morphological pattern of collateral anastomoses of extracranial vertebral arteries and discuss its clinical significance.

目的：观察椎动脉颅外段的侧支吻合情况，并探讨其临床意义。

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