单项选择题
A.20~40 B.40~60 C.60~80 D.80~100
A.4 B.8 C.16 D.24
A.150~250 B.350~450 C.450~550 D.550~650
A.12V,12VB.12V,24VC.24V,12VD.24V,24V
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