单项选择题
A.100mm B.200mm C.150mm D.50mm
A.30Ω B.40Ω C.20Ω D.35ΩA
A.不超过500伏 B.不超过600伏 C.不超过200伏 D.超过100伏
A.8.5% B.9.5% C.10.5% D.11.5%
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