单项选择题
A.＞12MΩ B.＞2MΩ C.＞1MΩ D.＞0.5MΩ
A.≥1.5Mpa B.<0.45Mpa C.≥0.45Mpa D.<1.5Mpa
A.380V±10% B.220V±10% C.110V±10% D.36V±10%