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1·Objective To study the ultrasonic characteristic of vertebral artery cervical spondylopathy (VACS).

目的进一步探讨椎动脉型颈椎病(VACS)的超声表现。

2·The All Vac is the Budget vac with a real appetite. All Vacs suck up rock, wood chips and shavings, sand, gravel, leaves, compost, mud, sludge, glass and debris.

真空吸尘器用以处理石块、木片和刨片、沙砾、碎石、树叶、堆肥、泥浆、烂泥、玻璃和瓦砾。