单项选择题
A.变大 B.变小 C.不变 D.不确定
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
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