下列哪些疾病可出现直腿抬高试验阳性（）
A.腰椎间盘突出症
B.梨状肌综合征
C.慢性腰肌劳损
D.髂胫束紧张
E.退生性脊柱炎
参考答案：A, B, D
In classes, you’d better understand as much as possible while ______ notes.
A．take
B．taken
C．taking
D．to take
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