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【单选题】
秩边穴的定位是A.
在骶区,第1骶后,骶正中嵴旁开3寸
B.
在骶区,第2低后,低正中嵴旁开3寸
C.
在骶区,第3骶后,骶正中嵴旁开3寸
D.
在骶区,第4骶后,骶正中嵴旁开3寸
E.
在骶区,第3骶后,骶正中嵴旁开1.5寸
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A.
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B.
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C.
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D.
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A.
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