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Which is true on the subarachnoid space in the vertebral canal（）。
A:lies between dura matter and arachnoid
B:up to subarachnoid space in the skull by the foramen magnum
C:down the the height of the fifth sacral vertebral
D:terminal cistern is formed by the space below the second sacral vertebral
E:the fluid in it can communicate with that in the center canal of spinal cord directly

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出自：麻醉学高级职称

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