题目：
1：2000的旧结核菌素0.1ml内所含结核菌素单位为（）
A.0.5U
B.1U
C.2U
D.10u
E.5U
答案：
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参考答案：接头尺寸；连接型号；公母扣
1：2000的旧结核菌素0.1ml内所含结核菌素单位为（） A.0.5U B.1U
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