单项选择题
A.绝缘 B.防潮 C.散热 D.绝缘、防潮和散热
A.12V B.24V C.6V D.3V
A.0.7～0.9mm B.0.7～0.9cm C.0.9～1.1mm D.0.9～1.1cm
A.0.26～0.52 B.0.26～0.52k C.0.52～0.76 D.0.52～0.76k
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