单项选择题
A.105℃ B.95℃ C.85℃ D.50℃
A.5％一7% B.3％一8% C.2％一3% D.1.5％-2%
A.300MΩ B.100MΩ C.10MΩ D.0.5MΩ
A.0.5、0.7m B.0.7m C.0.8一1.0m D.1.2m
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