单项选择题
A.1/4 B.1/3 C.2/3 D.1/2
A.短路线 B.接地放电棒 C.表计 D.安培表
A.2% B.5% C.10% D.15%
A.5%~100% B.5%~95% C.10%~100% D.10%~95%
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