单项选择题
A.2000Pa B.1000Pa C.2800Pa D.1800Pa
A.左零右火，零线接地正常 B.左火右零，零线接地正常 C.左零右火，零线有带电 D.左火右零，零线有带电
A.6 B.7 C.8 D.9
A.DSH B.DSF C.DSJ D.DSL
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