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女性,30岁。睁眼困难伴复视2年,晨轻暮重,休息后好转。下列检查有助于明确诊断,除外()
A . 新斯的明试验
B . 疲劳试验
C . 胸部CT扫描
D . 乙酰胆碱受体抗体测定
E . 椎管造影
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