单项选择题
A.40℃、8h B.50℃、24h C.60℃、24h D.70℃、12h
A.0.5mm B.0.6mm C.0.7mm D.0.8mm
A.≤0.1Ω B.≤0.15Ω C.≤0.2Ω D.≤0.25Ω
A.1mm B.1.5mm C.2mm D.2.5mm
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