单项选择题
A.4/5馈线 B.7/8馈线 C.7/16馈线 D.1/2馈线
A.40mm B.50mm C.30mm D.20mm
A.8cm B.10cm C.15cm D.20cm
A.16mm2 B.25mm2 C.30mm2 D.36mm2
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